USB lithium battery recharge, with screen and button Can set up hours or minutes, seting time is 99 hours with 59 minutes Can't be opened before the 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 3000 times, the durability become 3.5 hours after each charging Can be used to lock , head harness or any other sex toys Feature: Color: Black Material: metal Instructions for use: 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". 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. Start timing:After 5 seconds, the countdown will start, and the electronic lock will beep for a long time. The lock "lock" on the screen, you cannot unlock it by pressing any key at this time. Timing is complete:After the timing is complete, the lock ring will automatically pop up, and the unlock "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. Package Contents: 1 x Timer Padlock 1 x USB Cable Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.