Super Standby Time: Universal USB rechargeable, the maximum standby time can reach 500 hours when fully charged. Easy to Use: Small LCD screen with backlight, shows unlock time soft and clear, 3 small buttons for setting hours or minutes, easy to operate. Metal Body: The lock body is made of metal, smooth surface, upgraded textured metal lock. Durability and Safety. 99 Hours Timer: Free setting unlock time, up to 99 hours and 59 minutes. After the timing is completed, the lock ring will automatically open. Improved sleep quality: Reduce the time of observing mobile phones, fall asleep earlier, improve sleep quality, improve sleep quality. immunity and live a healthy life, control tobacco, reduce the number of cigarettes per day, gradually extend the interval and cultivate healthy lifestyle habits. Features: Product Name: Metal Timer Lock . Materials: alloy and silicone. Color: silver. Battery: 3.7V/200mA (included). Standby time: more than 500 hours. Dimensions: approx. 45 x 78 x 18 mm. Contents: 1 metal timer. 1 charging cable. Note: 1. Due to the lighting and individual monitor settings, the items color may be slightly different from the pictures. 2. As the measurements are taken by hand, the dimensions indicated may vary by 0.5 to 2 cm.