Smart lock Metal Timing Lock Biometric Electronic Lock Timer Padlock Lock USB Rechargeable Description Material: Metal Color: Black / Silver Package : Discreet package , protect your privacy Feature : USB lithium battery recharge, with screen and button Can set up hours or minutes, longest setting time is 99 hours with 59 minutes Can't be opened before the time out 4 Grades waterproof Bear the pull 130kg from horizontal or vertical, 3 grades resistance falling the durability is 500 hours after once chargeable After 1200 times charging and discharging, battery capacity decline 15%, after 3 000 times, the durability becomes 3.5 hours after each charging Instructions for use 1. Unlock and lock: Locking: Align the lock ring with the hole on one end, then press down to lock it. "Lock" appears in the upper right corner of the screen Unlock: Press the middle "lock" button to automatically bounce. The display is "unlocked". 2. Set the unlock time: Press: the "H" button on the left to set the hour, and the "M" button on the right to set the minute. After adjustment, press the middle "lock" button to start the countdown. Before the timer starts, there will be a 5-second countdown beep (in sound mode). Within 5 seconds, you can press any key to cancel the set time. 3. Start timing After 5 seconds, the countdown will start, and the electronic lock will beep for a long time. The lock icon "lock" on the screen, you cannot unlock it by pressing any key at this time. 4. Timing is complete After the timing is complete, the lock ring will automatically pop up, and the unlock icon "picture" will be displayed on the screen. Press any key to display the time just counted on the screen, and then press the timing key to repeat the timing.