USB lithium battery charging. The lock body has a small display and buttons to adjust hours and minutes. Maximum time setting is 99 hours and 59 minutes. Horizontal and vertical tensile strength (destructive pulling) 130KG. Level 3 anti-fall protection (scale from level 1 to level 5, with level 1 being maximum). Waterproof rating IP4, protects against outdoor rain and splashing. Battery lasts up to 30 days with typical usage of 4 hours per day. After 1200 charge and discharge cycles, battery capacity decreases by 15%. After 3000 cycles, each charge lasts approximately 3.5 hours. Size: 46 x 40 x 20mm Wire rope length: 90mm; diameter: 2.5mm Wire rope head diameter: 4mm Material: ABS + metal Color: black Package Contents: 2 x lock Note: Light and display differences may cause slight color variation between image and actual item. Measurement allows an error of +/- 1-3cm.