How to play: 4 targets (vibration sensors) correspond to 4 indicator lights. When a target senses vibration (arrow hits), the corresponding indicator lights up. When all indicators light up, the mechanism is triggered, opening the electromagnetic lock and lighting up the light or triggering the electric push rod. After a successful trigger, there is a sound effect. The TF card stores the audio, which can be changed by the user in MP3 format. It can also be used to change the reset method (power-on reset).