In the updated version, this module is only a part of the reverberation circuit, and a number of peripheral circuits are needed. There is no microphone amplifier and hybrid circuit. The user needs to be proficient in circuit analysis capabilities. The working voltage is DC 5V. There are 100 effects from 0-99. Rotate to select the number, and then press to confirm. Now put the reverb volume sound potentiometer on the board. Material:Electronic component colour: Random Color (don't accept the specified color.) Different batches of modules have different layouts, which will not affect the use Package Contents: 1 x DSP Digital Reverb Module Only the above package content, other products are not included. Note: Light 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.