Features: 1. USB charging with a lithium battery, featuring a small display and buttons to set hours and minutes, supporting a maximum time of 99 hours and 59 minutes. 2. Horizontal and vertical pulling force (destructive pulling force) of 130 kg, with a 3rd level anti-drop rating (level 1 is maximum, level 5 is minimal). 3. Waterproof level four, designed to withstand rain and outdoor splashes. 4. Up to 30 days of battery life on a single charge with 4 hours of daily use. 5. Battery capacity decreases by 15% after 1200 charge-discharge cycles; after 3000 cycles, each charge lasts about 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 contents are 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.