ENERpower Softpack battery 52V in format 14S2P | 510 Wh | capacity 10 Ah | for Pedelecs, eBikes DIY | with M50T. Important General Information The 52V (14S) batteries in softpack, which we manufacture in Berlin, have 2 versions square and rectangular. The batteries are manufactured in plastic cell brackets. Charging is done with a high-quality spiral cable (20 cm – 100 cm) with an XLR-3 PINS, discharging via a discharge cable with XT90 connector (male). A fuse of 40A in a water-resistant holder limits the current drain. In the square version, 10 cells are used on the longest side (200 mm). We manufacture this type of battery in the formats 14S3P (construction 10×5), 14S4P (construction 10×6), 14S5P (construction 10×7) and 14S6P (construction 10×9) etc. In the rectangular version, 14 cells are used on the longest side (280 mm). We assemble this type of battery in the formats 14S2P (construction 14×2), 14S3P (14×3), 14S4P (14×4), 14S5P (14×5) and 14S6P (14×6) etc. The Battery Management System (BMS) is always mounted on the longest side of the battery. At this side the battery is approx. 10 -15 mm thicker. We manufacture the Softpack batteries with FR4 insulation, flame retardant composites made of epoxy resin and glass fabrics. FR-4 is used, among other things, as an electrically non-conductive carrier material for electrical circuit boards. No Battery Gauge is mounted on the battery Compatible with 48V motors 250 Watts / 500 Watts / 540 Watts / 750 Watt / 1000 Watt Highlights High-quality production - Made in Germany Production Just-In-Time BMS with an integrated passive balancer and protection against overcharge, over-discharge, over-discharge (temperature monitoring) Direct from the manufacturer Rechargeable - After 300 charging cycles, still maintains 80% of the original capacity No memory effect - charge the battery whenever you want Environmentally friendly in accordance with EU Directive 2002/95 / EC (RoHS) Technical Specifications Li-ion Cell: INR21700-M50T Voltage (nominal): 52V (50.4V - 51.8V) Capacity: 10Ah Power: approx. 510 Wh Configuration: 14S2P (set up: 14×2) Internal resistance: < 75 mOhm Charge voltage: 58.8V End-of-discharge voltage: 42V Continuous discharge Current: 20A = 1000 watts 5 seconds discharge current: 30A = 1500  watts Weight: 2.2 Kg. Charge connector (connects to the charger): XLR-3 (3 pins) Discharge connector (connects to the motor): XT-90 / XT-60 / Anderson PowerPole Dimensions Length: 280 mm Width: 50 mm – 70 mm Height: 74 mm

ENERpower Softpack battery 52V in format 14S2P | 510 Wh | capacity 10 Ah | for Pedelecs, eBikes DIY | with M50T. Important General Information The 52V (14S) batteries in softpack, which we manufacture in Berlin, have 2 versions square and rectangular. The batteries are manufactured in plastic cell brackets. Charging is done with a high-quality spiral cable (20 cm – 100 cm) with an XLR-3 PINS, discharging via a discharge cable with XT90 connector (male). A fuse of 40A in a water-resistant holder limits the current drain. In the square version, 10 cells are used on the longest side (200 mm). We manufacture this type of battery in the formats 14S3P (construction 10×5), 14S4P (construction 10×6), 14S5P (construction 10×7) and 14S6P (construction 10×9) etc. In the rectangular version, 14 cells are used on the longest side (280 mm). We assemble this type of battery in the formats 14S2P (construction 14×2), 14S3P (14×3), 14S4P (14×4), 14S5P (14×5) and 14S6P (14×6) etc. The Battery Management System (BMS) is always mounted on the longest side of the battery. At this side the battery is approx. 10 -15 mm thicker. We manufacture the Softpack batteries with FR4 insulation, flame retardant composites made of epoxy resin and glass fabrics. FR-4 is used, among other things, as an electrically non-conductive carrier material for electrical circuit boards. No Battery Gauge is mounted on the battery Compatible with 48V motors 250 Watts / 500 Watts / 540 Watts / 750 Watt / 1000 Watt Highlights High-quality production - Made in Germany Production Just-In-Time BMS with an integrated passive balancer and protection against overcharge, over-discharge, over-discharge (temperature monitoring) Direct from the manufacturer Rechargeable - After 300 charging cycles, still maintains 80% of the original capacity No memory effect - charge the battery whenever you want Environmentally friendly in accordance with EU Directive 2002/95 / EC (RoHS) Technical Specifications Li-ion Cell: INR21700-M50T Voltage (nominal): 52V (50.4V - 51.8V) Capacity: 10Ah Power: approx. 510 Wh Configuration: 14S2P (set up: 7×4) Internal resistance: < 75 mOhm Charge voltage: 58.8V End-of-discharge voltage: 42V Continuous discharge Current: 20A = 1000 watts 5 seconds discharge current: 30A = 1500  watts Weight: 2.2 Kg. Charge connector (connects to the charger): XLR-3 (3 pins) Discharge connector (connects to the motor): XT-90 / XT-60 / Anderson PowerPole Dimensions Length: 165 mm Width: 100 mm – 120 mm Height: 74 mm

ENERpower Softpack battery 52V in format 14S4P | 830 Wh | capacity 16 Ah | for Pedelecs, eBikes DIY | with INR21700-40T. Important General Information The 52V (14S) batteries in softpack, which we manufacture in Berlin, have 2 versions square and rectangular. The batteries are manufactured in plastic cell brackets. Charging is done with a high-quality spiral cable (20 cm – 100 cm) with an XLR-3 PINS, discharging via a discharge cable with XT90 connector (male). A fuse of 40A in a water-resistant holder limits the current drain. In the square version, 10 cells are used on the longest side (220 mm). We manufacture this type of battery in the formats 14S3P (construction 10×5), 14S4P (construction 10×6), 14S5P (construction 10×7) and 14S6P (construction 10×9) etc. In the rectangular version, 14 cells are used on the longest side (288 mm). We assemble this type of battery in the formats 14S2P (construction 14×2), 14S3P (14×3), 14S4P (14×4), 14S5P (14×5) and 14S6P (14×6) etc. The Battery Management System (BMS) is always mounted on the longest side of the battery. At this side the battery is approx. 10 -15 mm thicker. We manufacture the Softpack batteries with FR4 insulation, flame retardant composites made of epoxy resin and glass fabrics. FR-4 is used, among other things, as an electrically non-conductive carrier material for electrical circuit boards. In this battery we have an LED charge status display (empty/25%/50%/75%/full). This is located on the upper side of the battery Compatible with 52V motors 250 Watts / 500 Watts / 540 Watts / 750 Watt / 950 Watt / 1200 Watt / 1500 Watt / 2000 Watt Highlights High-quality production - Made in Germany Production Just-In-Time BMS with an integrated passive balancer and protection against overcharge, over-discharge, over-discharge (temperature monitoring) Direct from the manufacturer Rechargeable - After 300 charging cycles, still maintains 80% of the original capacity No memory effect - charge the battery whenever you want Environmentally friendly in accordance with EU Directive 2002/95 / EC (RoHS) Technical Specifications Li-ion Cell: INR21700-40T Voltage (nominal): 52V (50.4V - 51.8V) Capacity: 16Ah Power: approx. 830 Wh Configuration: 14S4P (set up: 14×4) Internal resistance: < 75 mOhm Charge voltage: 58.8V End-of-discharge voltage: 42V Continuous discharge Current: 40A = 2000 watts 5 seconds discharge current: 60A = 3000 watts Weight: 4.1 Kg. Charge connector (connects to the charger): XLR-3 (3 pins) Discharge connector (connects to the motor): XT-90 Dimensions Length: 325 mm Width: 95 mm – 115 mm Height: 72 mm

ENERpower Softpack battery 52V in format 14S5P | 1020 Wh | capacity 20 Ah | for Pedelecs, eBikes DIY | with INR21700-40T. Important General Information The 52V (14S) batteries in softpack, which we manufacture in Berlin, have 2 versions square and rectangular. The batteries are manufactured in plastic cell brackets. Charging is done with a high-quality spiral cable (20 cm – 100 cm) with an XLR-3 PINS, discharging via a discharge cable with XT90 connector (male). A fuse of 40A in a water-resistant holder limits the current drain. In the square version, 10 cells are used on the longest side (220 mm). We manufacture this type of battery in the formats 14S3P (construction 10×5), 14S4P (construction 10×6), 14S5P (construction 10×7) and 14S6P (construction 10×9) etc. In the rectangular version, 14 cells are used on the longest side (288 mm). We assemble this type of battery in the formats 14S2P (construction 14×2), 14S3P (14×3), 14S4P (14×4), 14S5P (14×5) and 14S6P (14×6) etc. The Battery Management System (BMS) is always mounted on the longest side of the battery. At this side the battery is approx. 10 -15 mm thicker. We manufacture the Softpack batteries with FR4 insulation, flame retardant composites made of epoxy resin and glass fabrics. FR-4 is used, among other things, as an electrically non-conductive carrier material for electrical circuit boards. In this battery we have an LED charge status display (empty/25%/50%/75%/full). This is located on the upper side of the battery Compatible with 48V motors 250 Watts / 500 Watts / 540 Watts / 750 Watt / 950 Watt / 1200 Watt / 1500 Watt Highlights High-quality production - Made in Germany Production Just-In-Time BMS with an integrated passive balancer and protection against overcharge, over-discharge, over-discharge (temperature monitoring) Direct from the manufacturer Rechargeable - After 300 charging cycles, still maintains 80% of the original capacity No memory effect - charge the battery whenever you want Environmentally friendly in accordance with EU Directive 2002/95 / EC (RoHS) Technical Specifications Li-ion Cell: INR21700-40T Voltage (nominal): 52V (50.4V - 51.8V) Capacity: 20 Ah Power: approx. 1020 Wh Configuration: 14S5P (set up: 14×5) Internal resistance: < 75 mOhm Charge voltage: 58.8V End-of-discharge voltage: 42V Continuous discharge Current: 30A = 1500 watts 5 seconds discharge current: 40A = 2050 watts Weight: 5.1 Kg. Charge connector (connects to the charger): XLR-3 (3 pins) Discharge connector (connects to the motor): XT-90 Dimensions Length: 325 mm Width: 115 mm – 135 mm Height: 72 mm

ENERpower Softpack battery 52V in format 14S5P | 1300 Wh | capacity 25 Ah | for Pedelecs, eBikes DIY | with INR21700-M50T. Important General Information The 52V (14S) batteries in softpack, which we manufacture in Berlin, have 2 versions square and rectangular. The batteries are manufactured in plastic cell brackets. Charging is done with a high-quality spiral cable (20 cm – 100 cm) with an XLR-3 PINS, discharging via a discharge cable with XT90 connector (male). A fuse of 40A in a water-resistant holder limits the current drain. In the square version, 10 cells are used on the longest side (220 mm). We manufacture this type of battery in the formats 14S3P (construction 10×5), 14S4P (construction 10×6), 14S5P (construction 10×7) and 14S6P (construction 10×9) etc. In the rectangular version, 14 cells are used on the longest side (288 mm). We assemble this type of battery in the formats 14S2P (construction 14×2), 14S3P (14×3), 14S4P (14×4), 14S5P (14×5) and 14S6P (14×6) etc. The Battery Management System (BMS) is always mounted on the longest side of the battery. At this side the battery is approx. 10 -15 mm thicker. We manufacture the Softpack batteries with FR4 insulation, flame retardant composites made of epoxy resin and glass fabrics. FR-4 is used, among other things, as an electrically non-conductive carrier material for electrical circuit boards. Compatible with 48V motors 250 Watts / 500 Watts / 540 Watts / 750 Watt / 950 Watt / 1200 Watt / 1500 Watt Highlights High-quality production - Made in Germany Production Just-In-Time BMS with an integrated passive balancer and protection against overcharge, over-discharge, over-discharge (temperature monitoring) Direct from the manufacturer Rechargeable - After 300 charging cycles, still maintains 80% of the original capacity No memory effect - charge the battery whenever you want Environmentally friendly in accordance with EU Directive 2002/95 / EC (RoHS) Technical Specifications Li-ion Cell: INR21700-M50T Voltage (nominal): 52V (50.4V - 51.8V) Capacity: 25 Ah Power: approx. 1300 Wh Configuration: 14S5P (set up: 14×5) Internal resistance: < 75 mOhm Charge voltage: 58.8V End-of-discharge voltage: 42V Continuous discharge Current: 30A = 1500 watts 5 seconds discharge current: 40A = 2050 watts Weight: 5.35 Kg. Charge connector (connects to the charger): XLR-3 (3 pins) Discharge connector (connects to the motor): XT-90 / XT-60 / Anderson PowerPole Dimensions Length: 325 mm Width: 120 mm – 140 mm Height: 74 mm

ENERpower Softpack battery 52V in format 14S6P | 1550 Wh | capacity 30 Ah | for Pedelecs, eBikes DIY | with INR21700-50E. This battery can be chosen with 3 different Smart BMS´s: 30A: up to 1550 Watt 40A: up to 2080 Watt 50A: Up to 2500 Watt Important General Information The 52V (14S) batteries in softpack, which we manufacture in Berlin, have 2 versions square and rectangular. The batteries are manufactured in plastic cell brackets. Charging is done with a high-quality spiral cable (20 cm – 100 cm) with an XLR-3 PINS, discharging via a discharge cable with XT90 connector (male). A fuse of 40A in a water-resistant holder limits the current drain. In the square version, 10 cells are used on the longest side (220 mm). We manufacture this type of battery in the formats 14S3P (construction 10×5), 14S4P (construction 10×6), 14S5P (construction 10×7) and 14S6P (construction 10×9) etc. In the rectangular version, 14 cells are used on the longest side (288 mm). We assemble this type of battery in the formats 14S2P (construction 14×2), 14S3P (14×3), 14S4P (14×4), 14S5P (14×5) and 14S6P (14×6) etc. The Battery Management System (BMS) is always mounted on the longest side of the battery. At this side the battery is approx. 10 -15 mm thicker. We manufacture the Softpack batteries with FR4 insulation, flame retardant composites made of epoxy resin and glass fabrics. FR-4 is used, among other things, as an electrically non-conductive carrier material for electrical circuit boards. Highlights High-quality production - Made in Germany Production Just-In-Time BMS with an integrated passive balancer and protection against overcharge, over-discharge, over-discharge (temperature monitoring) Direct from the manufacturer Rechargeable - After 300 charging cycles, still maintains 80% of the original capacity No memory effect - charge the battery whenever you want Environmentally friendly in accordance with EU Directive 2002/95 / EC (RoHS) Technical Specifications Li-ion Cell: INR21700-50E Voltage (nominal): 52V (50.4V - 51.8V) Capacity: 30 Ah Power: approx. 1550 Wh Configuration: 14S6P (set up: 14×6) Internal resistance: < 75 mOhm Charge voltage: 58.8V End-of-discharge voltage: 42V Charging Current: < 8A Weight: 6.1 Kg. Charge connector (connects to the charger): XLR-3 (3 pins) Discharge connector (connects to the motor): XT-90 / XT-60 / Anderson SB50 Dimensions Length: 325 mm Width: 140 mm – 160 mm Height: 72 mm

ENERpower Softpack battery 52V in format 14S8P | 2080 Wh | capacity 40 Ah | for Pedelecs, eBikes DIY | with INR21700-50E. Important General Information The 52V (14S) batteries in softpack, which we manufacture in Berlin, have 2 versions square and rectangular. The batteries are manufactured in plastic cell brackets. Charging is done with a high-quality spiral cable (20 cm – 100 cm) with an XLR-3 PINS, discharging via a discharge cable with XT90 connector (male). A fuse of 40A in a water-resistant holder limits the current drain. In the square version, 10 cells are used on the longest side (220 mm). We manufacture this type of battery in the formats 14S3P (construction 10×5), 14S4P (construction 10×6), 14S5P (construction 10×7) and 14S6P (construction 10×9) etc. In the rectangular version, 14 cells are used on the longest side (288 mm). We assemble this type of battery in the formats 14S2P (construction 14×2), 14S3P (14×3), 14S4P (14×4), 14S5P (14×5) and 14S6P (14×6) etc. The Battery Management System (BMS) is always mounted on the longest side of the battery. At this side the battery is approx. 10 -15 mm thicker. We manufacture the Softpack batteries with FR4 insulation, flame retardant composites made of epoxy resin and glass fabrics. FR-4 is used, among other things, as an electrically non-conductive carrier material for electrical circuit boards. Compatible with 48V motors 250 Watts / 500 Watts / 540 Watts / 750 Watt / 950 Watt / 1200 Watt / 1500 Watt Highlights High-quality production - Made in Germany Production Just-In-Time BMS with an integrated passive balancer and protection against overcharge, over-discharge, over-discharge (temperature monitoring) Direct from the manufacturer Rechargeable - After 300 charging cycles, still maintains 80% of the original capacity No memory effect - charge the battery whenever you want Environmentally friendly in accordance with EU Directive 2002/95 / EC (RoHS) Technical Specifications Li-ion Cell: INR21700-50E Voltage (nominal): 52V (50.4V - 51.8V) Capacity: 40 Ah Power: approx. 2080 Wh Configuration: 14S8P (set up: 14×8) Internal resistance: < 75 mOhm Charge voltage: 58.8V End-of-discharge voltage: 42V Continuous discharge Current: 30A = 1500 watts 5 seconds discharge current: 40A = 2050 watts Weight: 8.1 Kg. Charge connector (connects to the charger): XLR-3 (3 pins) Discharge connector (connects to the motor): XT-90 / XT-60 / Anderson PowerPole Dimensions Length: 325 mm Width: 180 mm – 200 mm Height: 74 mm

ENERpower Softpack battery 52V in format 14S8P | 2080 Wh | capacity 40 Ah | for Pedelecs, eBikes DIY | with INR21700-M50T Important General Information The 52V (14S) batteries in softpack, which we manufacture in Berlin, have 2 versions square and rectangular. The batteries are manufactured in plastic cell brackets. Charging is done with a high-quality spiral cable (20 cm – 100 cm) with an XLR-3 PINS, discharging via a discharge cable with XT90 connector (male). A fuse of 40A in a water-resistant holder limits the current drain. In the square version, 10 cells are used on the longest side (220 mm). We manufacture this type of battery in the formats 14S3P (construction 10×5), 14S4P (construction 10×6), 14S5P (construction 10×7) and 14S6P (construction 10×9) etc. In the rectangular version, 14 cells are used on the longest side (288 mm). We assemble this type of battery in the formats 14S2P (construction 14×2), 14S3P (14×3), 14S4P (14×4), 14S5P (14×5) and 14S6P (14×6) etc. The Battery Management System (BMS) is always mounted on the longest side of the battery. At this side the battery is approx. 10 -15 mm thicker. We manufacture the Softpack batteries with FR4 insulation, flame retardant composites made of epoxy resin and glass fabrics. FR-4 is used, among other things, as an electrically non-conductive carrier material for electrical circuit boards. Compatible with 48V motors 250 Watts / 500 Watts / 540 Watts / 750 Watt / 950 Watt / 1200 Watt / 1500 Watt / 2000 Watt Highlights High-quality production - Made in Germany Production Just-In-Time BMS with an integrated passive balancer and protection against overcharge, over-discharge, over-discharge (temperature monitoring) Direct from the manufacturer Rechargeable - After 300 charging cycles, still maintains 80% of the original capacity No memory effect - charge the battery whenever you want Environmentally friendly in accordance with EU Directive 2002/95 / EC (RoHS) Technical Specifications Li-ion Cell: INR21700-M50T Voltage (nominal): 52V (50.4V - 51.8V) Capacity: 40 Ah Power: approx. 2080 Wh Configuration: 14S8P (set up: 14×8) Internal resistance: < 75 mOhm Charge voltage: 58.8V End-of-discharge voltage: 42V Continuous discharge Current: 40A = 2000 watts 5 seconds discharge current: 60A = 3000 watts Weight: 8.1 Kg. Charge connector (connects to the charger): XLR-3 (3 pins) Discharge connector (connects to the motor): XT-90 Dimensions Length: 325 mm Width: 180 mm – 200 mm Height: 74 mm

ENERpower Softpack battery 52V in format 14S9P | 2320Wh | capacity 45 Ah | for Pedelecs, eBikes DIY | with INR21700-M50T Important General Information The 52V (14S) batteries in softpack, which we manufacture in Berlin, have 2 versions square and rectangular. The batteries are manufactured in plastic cell brackets. Charging is done with a high-quality spiral cable (20 cm – 100 cm) with an XLR-3 PINS, discharging via a discharge cable with XT90 connector (male). In the square version, 10 cells are used on the longest side (220 mm). We manufacture this type of battery in the formats 14S3P (construction 10×5), 14S4P (construction 10×6), 14S5P (construction 10×7) and 14S6P (construction 10×9) etc. In the rectangular version, 14 cells are used on the longest side (288 mm). We assemble this type of battery in the formats 14S2P (construction 14×2), 14S3P (14×3), 14S4P (14×4), 14S5P (14×5) and 14S6P (14×6) etc. The Battery Management System (BMS) is always mounted on the longest side of the battery. At this side the battery is approx. 10 -15 mm thicker. We manufacture the Softpack batteries with FR4 insulation, flame retardant composites made of epoxy resin and glass fabrics. FR-4 is used, among other things, as an electrically non-conductive carrier material for electrical circuit boards. Compatible with 48V motors 250 Watts / 500 Watts / 540 Watts / 750 Watt / 950 Watt / 1200 Watt / 1500 Watt / 2000 Watt Highlights High-quality production - Made in Germany Production Just-In-Time BMS with an integrated passive balancer and protection against overcharge, over-discharge, over-discharge (temperature monitoring) Direct from the manufacturer Rechargeable - After 300 charging cycles, still maintains 80% of the original capacity No memory effect - charge the battery whenever you want Environmentally friendly in accordance with EU Directive 2002/95 / EC (RoHS) Technical Specifications Li-ion Cell: INR21700-M50T Voltage (nominal): 52V (50.4V - 51.8V) Capacity: 45 Ah Power: approx. 2320 Wh Configuration: 14S9P (set up: 14×9) Internal resistance: < 75 mOhm Charge voltage: 58.8V End-of-discharge voltage: 42V Continuous discharge Current: 40A = 2000 watts 5 seconds discharge current: 60A = 3000 watts Weight: 9.1 Kg. Charge connector (connects to the charger): XLR-3 (3 pins) Discharge connector (connects to the motor): XT-90 Dimensions Length: 325 mm Width: 180 mm – 200 mm Height: 74 mm

ENERpower Softpack battery 52V in format 14S10P | 2600Wh | capacity 50 Ah | for Pedelecs, eBikes DIY | with INR21700-M50T Important General Information The 52V (14S) batteries in softpack, which we manufacture in Berlin, have 2 versions square and rectangular. The batteries are manufactured in plastic cell brackets. Charging is done with a high-quality spiral cable (20 cm – 100 cm) with an XLR-3 PINS, discharging via a discharge cable with XT90 connector (male). In the square version, 10 cells are used on the longest side (220 mm). We manufacture this type of battery in the formats 14S3P (construction 10×5), 14S4P (construction 10×6), 14S5P (construction 10×7) and 14S6P (construction 10×9) etc. In the rectangular version, 14 cells are used on the longest side (288 mm). We assemble this type of battery in the formats 14S2P (construction 14×2), 14S3P (14×3), 14S4P (14×4), 14S5P (14×5) and 14S6P (14×6) etc. The Battery Management System (BMS) is always mounted on the longest side of the battery. At this side the battery is approx. 10 -15 mm thicker. We manufacture the Softpack batteries with FR4 insulation, flame retardant composites made of epoxy resin and glass fabrics. FR-4 is used, among other things, as an electrically non-conductive carrier material for electrical circuit boards. Compatible with 48V motors 250 Watts / 500 Watts / 540 Watts / 750 Watt / 950 Watt / 1200 Watt / 1500 Watt / 2000 Watt Highlights High-quality production - Made in Germany Production Just-In-Time BMS with an integrated passive balancer and protection against overcharge, over-discharge, over-discharge (temperature monitoring) Direct from the manufacturer Rechargeable - After 300 charging cycles, still maintains 80% of the original capacity No memory effect - charge the battery whenever you want Environmentally friendly in accordance with EU Directive 2002/95 / EC (RoHS) Technical Specifications Li-ion Cell: INR21700-M50T Voltage (nominal): 52V (50.4V - 51.8V) Capacity: 50 Ah Power: approx. 2600 Wh Configuration: 14S10P (set up: 14×10) Internal resistance: < 75 mOhm Charge voltage: 58.8V End-of-discharge voltage: 42V Continuous discharge Current: 40A = 2000 watts 5 seconds discharge current: 60A = 3000 watts Weight: 10,50 Kg. Charge connector (connects to the charger): XLR-3 (3 pins) Discharge connector (connects to the motor): XT-90 Dimensions Length: 325 mm Width: 235 mm – 255 mm Height: 74 mm