【99 Hours Time】Free setting of unlock time, up to 99 hours and 59 minutes.After timing is completed, the lock ring will automatically open.【Super Standby Time】Universal USB Micro USB rechargeable, the maximum standby time can reach 500 hours once fully charged.【Metal Body】The lock body is made of metal and smooth surfaces, upgraded textured metal lock.Durability and safety.【Ease of Use】Small LCD screen with backlight, shows unlock time smoothly and clearly, 3 small buttons to set hours or minutes, easy to use.【Improving sleep quality】Reduce the time spent looking at mobile phones, fall asleep early, improve sleep quality, strengthen immunity and lead a healthy life, Control smoking: limit smoking, reduce the numberof cigarettes per day, gradually lengthen the interval, and cultivate healthy lifestyle habits