Features: 1. USB charging with a lithium battery, with a small display and buttons to set hours and minutes, supports a maximum time of 99 hours and 59 minutes. 2. Horizontal and vertical pull force (destructive pull force) of 130 kg, with a 3rd level anti-fall rating (level 1 is maximum, level 5 is minimum). 3. Waterproof class four, designed to withstand rain and splashes outdoors. 4. Up to 30 days of battery life on a single charge when used 4 hours daily. 5. Battery capacity decreases by 15% after 1200 charge-discharge cycles; after 3000 cycles, each charge lasts approximately three and a half hours. Product Details: Specifications: - Size: 46 x 40 x 20 mm - Wire length: 90 mm, diameter: 2.5 mm - Wire head diameter: 4 mm - Material: ABS + metal - Color: Black Package contents: 2 x Locks Note: Only the above package content is included; other products are not included. Light and different displays may cause a slight color variation from the actual item. The allowed measurement error is +/- 1-3 cm.