Usage Tips:1. Super Standby Time: universal usb rechargeable, max standby time can reach up 500hours once full charge. 2. Easy Operate: samll LCD with backlight, display the unlock time soft and clear, 3 small buttons to set hours or minutes, easy to use. 3. Metal Body: The Lock body is made of metal, Sharp edges and smooth surfaces, enhanced textured metal lock.Durability and Security. 4. 99 Hours Timing: Free setting of unlocking time, up to 99 hours and 59 miunutes.after the timing is finished, the lock ring will open automatically. 5. Improved sleep quality: reduce the time of looking at mobile phones, fall asleep early, improve sleep quality, enhance immunity, and live a healthy life, Control smoking: limit smoking, reduce the number of cigarettes per day, gradually extend the interval, and cultivate healthy living habits Product Name:Metal Timer Lock Battery: 3.7V/200mA Battery(included) Standby time: more than 500 hours Size: (Approx) 45 x 78 x 18mm/1.77 x 3.07 x 0.7inch Lock Type: Keyed Padlock color:White / Black Material:ABS Package Contents: 1 x Time lock Only the above package content, other products are not included. Note: Light reflection 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.