How to play: 1-4 receivers are shot at by laser at the same time to unlock, and the electromagnetic lock is attracted after 1 minute when the laser is removed. Reset can be set: reset by removing the laser, reset after 1 minute when the laser is removed, reset by re-powering on. Sound effect: supports audio modification, MP3 format, TF card storage, audio is divided into two parts, the first part plays when power is turned on, and the second part plays after the level is completed.