Maximum 99 hour timer digital time lock with LCD backlight for easy viewing in low light. Three buttons control the setup: left H to set hours, right M to set minutes, and the middle lock button to set and start. The maximum time is 99 hours and 59 minutes. USB battery and long standby time builtin 3.7 V / 200 mAh battery. Charged via the included USB cable. A single charge provides approximately 500 hours of use. Start timer and control a five second countdown sounds before the timer activates. If you press any button within five seconds, the set time is erased. After five seconds, the countdown begins and the electronic lock emits a long beep to start the timer. materials and durability made from metal for robustness. Designed to resist tampering and lock picking. Durable and does not rust easily. Once locked, the lock cannot be opened. Please organise your time wisely. Use scenarios secure a small value box or cabinet where access is allowed only during a scheduled window, such as specific work periods or study sessions. control access to tools or equipment in a workshop, studio, or shared space by enforcing timelimited openings. manage medication or items in a locked container, ensuring access only at approved times.