[Sturdy and Durable Metal Texture] Our timed lock box is made of strong and durable high-quality metal material, ensuring long-lasting durability and providing a secure storage solution for your belongings. Once locked, it cannot be covered. [Powered by Battery or USB Connection] Many customers complained that they could not unlock the phone lock box if the battery died. Our phone locker solves this problem. It is powered by 4 AA batteries (not included), and we also provide an external Type-C port in case the battery dies. So even if the battery dies during the locking process, the timed release lock box can still be unlocked by an external USB-C power source in an emergency. [Audio Alarm and Extendable Locking Time] The timed locker will beep 7 times when the lock is about to be activated and 1 beep when the locking time is over, which can serve as a useful reminder of the lock box status. You can also turn off the audio prompt if needed. This mobile jail allows you to increase the remaining time before unlocking. The maximum locking time is up to 365 days. It is perfect for short-term goals and long-term commitments. Safety lock box: For those who are addicted to mobile phones/games/electronic products in daily life, this is a meaningful tool. When your children lack self-control, you can use it to lock tempting items. And our mobile phone lock box is designed with a child lock button, which can effectively prevent children from pressing any button at will, causing unnecessary locks. Multifunctional, practical and user-friendly design: In addition to larger function buttons and a responsive customized digital display, our multifunctional user-friendly time lock box is very easy to use and can help us change bad habits in work and study. Or for those who overuse electronic products in social activities, are addicted to videos, or are distracted by mobile phones, it can also be used as a drug lock box. Color: Black Material: Metal Size: About 21 cm in length Package Contents: 1 * Lock Box 1 * Power Cord Only the above package contents, other products are not included. Note: Light reflection and different monitors may cause the color of the item in the picture to be slightly different from the actual object. The measurement allowable error is +/- 1-3cm.