1. USB lithium battery charging. The lock body has a display and buttons to increase hours and minutes. The maximum duration is 99 hours and 59 minutes. 2. Horizontal and vertical tensile force (destructive tensile force) 130KG fall protection level (maximum level 1 and minimum level 5) 3. Waterproof class four, prevents rain and splashes outdoors; 4. Use 4 hours per day, 30 days of battery life on one charge 5. After 1200 charges and discharges of the battery, the battery capacity decreases by 15%; after 3000 times, each charge can only last for three and a half hours. size: 46 x 40 x 20 mm Line length 90 mm; diameter 2.5 mm Line head diameter: 4 mm Material: ABS + metal color: black Package contents: 1 x lock Only the above package content, other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.