About this item Super Standby TimeUniversal usb rechargeable, max standby time can reach up 500hours once full charge. Easy OperateSamll LCD with backlight, display the unlock time soft and clear, 3 small buttons to set hours or minutes, easy to use. Metal BodyThe Lock body is made of metal, Sharp edges and smooth surfaces, enhanced textured metal lock. Durability and Security. 99 Hours TimingFree setting of unlocking time, up to 99 hours and 59 miunutes.after the timing is finished, the lock ring will open automatically. Improved sleep qualityReduce the time of looking at mobile phones, fall asleep early, improve sleep quality, enhance immunity, and live a health life, Control smoking: limit smoking, reduce the number of cigarettes per day, gradually extend the interval, and cultivate health living habits Super Standby TimeUniversal usb rechargeable, max standby time can reach up 500hours once full charge. Easy OperateSamll LCD with backlight, display the unlock time soft and clear, 3 small buttons to set hours or minutes, easy to use. Metal BodyThe Lock body is made of metal, Sharp edges and smooth surfaces, enhanced textured metal lock.Durability and Security. 99 Hours TimingFree setting of unlocking time, up to 99 hours and 59 miunutes. After the timing is finished, the lock ring will open automatically. [Improved Sleep Quality] Reduce the time of looking at mobile phones, Fall Asleep Early, Improve Sleep Quality, Enhance Immunity, and LIVE A Health li li Fe, Control Smoking: Limit Smoking, Reduce the Number of Cigarettes Per Day, GraDually Extend the interval, and cultivate health living habits