Features: 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 Specifications: Product Name:Metal Timer Lock Material:Alloy+Silicone Color:Silver/Black Battery: 3.7V/200mA Battery(included) Standby time: more than 500 hours Size: (Approx) 45*78*18mm/1.77*3.07*0.7inch Package Included: 1pc x Metal timer lock 1pc x charging cable 1pc x Chinese and English manual