Plug-in mechanism: The box has 12 sockets. Players connect them in pairs with plug-in cables. When all 12 sockets are connected correctly, a button light illuminates. Pressing the button unlocks the lock, and removing the plug-in cable resets the lock.
Dial mechanism: The box has 8 dials, each with an up or down position. Pressing the button unlocks the lock, and pressing the button resets the lock.
Sound effect version: Plays a voice message upon clearing a level. Audio can be modified and stored in MP3 format on a TF card.
Delivery contents: Plug-in box, dial box + 12V transformer + sound effect (optional)