Operating voltage: 5V This is just a form. There must be a lot of peripheral circuits to form a reverb circuit. Those who need to be proficient in the circuit can purchase it. Single-chip control, digital reverb chip, 24bit 192KHZ A / DD / A conversion circuit, no microphone amplifier circuit, 5V power supply, suitable for manufacturers to produce complete machine, old equipment upgrade and upgrade. Note: This model is a dual power supply version. Colour: green Material: PCB Size: 69x60mm Package Contents: 1 * Digital Reverberation Board 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.