METAL: Unlike the other time lock boxes on the current market, time locking container is made of metal, not only sturdy and durable, but also NOT easy to be broken or damaged. the volume of the phone lock box is 2.6L, the size 8.35 x 3.15 x 6.07 inches is nice to fit in school cabinet shelves, classroom, home, kitchen, bedroom, office, etc. 2 WAYS OF POWER SUPPLY: Our phone lock box has 2 ways of power supply, which powered by 4 x AA batteries and external type-c port. Therefore, if the batteries run out of power during locking, SAFE LOCKED BOX: It's a and meaningful tool for those phone / gaming / electronics addicts in , which can be used to keep tempting things locking up when your kids lack self-control. And our phone lock box is designed with child locking button, it can effectively prevent the kids from pressing the any buttons at random, which results in unnecessary locking. MULTIFUNCTIONAL PRACTICAL and USER-FRIENDLY DESIGN: Along with bigger function buttons and responsive customized digital display on it, our multifunctional user-friendly time lock box is very easy to use, and help us change habits such as quitting smoking, excessively drinking alcohol, overusing electronics, being addicted to or being distracted to cellphones at work, study or social activities, and it can be used as a medicine lock box too. BUILD GOOD HABITS: Overusing the mobile phones, gaming pads, excessively smoking and drinking alcohol, having too many snacks, chocolates, or other junk foods will have influence on your life and health. The locking duration of time lock box is up to 365 Colour:White Material:plastic Size:212 x 80 x 154.2mm Package Contents: 1 x Timed Lock Box 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.