Material : The storage box with timer and combination lock is made of thick PP plastic , ensuring sturdiness and resistance to deformation . It is designed to resist dust and water . The plastic construction makes the box safe , suitable for storing food and medicines Two Switchable Working Modes : 1 . Timed Mode for Storage Box : Set a timer lock from 1 minute to 30 days . After configuring the time , long press the OK button to start the countdown . The box remains locked until the timer ends (except for forced opening) . 2 . Non Timed Mode : Automatic locking function : long press D+H to lock , long press again to unlock Design Features : Two holes on the lid allow fresh air circulation for food . You can put your mobile phone into the box and charge your phone or any electronic device through these holes and keep the Wi Fi on when you lock them Size and Capacity : With external dimensions of 9.4x5.2x3.8 inches and a capacity of about 2 .8 liters . , the lockable storage box is sturdy , portable , and offers ample space for personal items . Besides , it can be stacked to save space Ideal for : Patients : Timed reminders for medication adherence to aid recovery . Phone/game addicts : Locks away phones , consoles , or electronics to help children/adolescents focus on studies , cultivating willpower and self control