1. Super Standby Time: Universal USB rechargeable, maximum standby time can reach up to 500 hours when fully charged. 2. Easy Operation: Small LCD with backlight, clearly displays the unlock time, 3 small buttons to set hours or minutes, simple to use. 3. Metal Body: The lock body is made of metal with sharp edges and surfaces, featuring an enhanced textured metal design for durability and security. 4. 99-Hour Timer: Freely set the unlocking time up to 99 hours and 59 minutes. After the timer ends, the lock ring opens automatically. 5. Improved Sleep Quality: Helps reduce screen time before bed, encouraging earlier sleep and better sleep quality. Product Name: Metal Timer Lock Battery: 3.7V/200mA Battery (included) Standby Time: More than 500 hours Size: 45 x 78 x 18mm / 1.77 x 3.07 x 0.7 inch Lock Type: Keyed Padlock Color: Black Material: ABS Package Contents: 1 x Time Lock Note: Light reflection and different displays may cause the color of the item to appear slightly different from the real thing. Measurement allows an error of +/- 1-3 cm.