1. Working Voltage Is 5V, Current Is About 70MA, 2. It Has Dynamic Anti-Howling Function, Various Reverberation Effects, Hall Room Effects, Delay, Chorus, Electronic Music, Etc.; 3. If The Machine To Be Modified Had A Reverberation Circuit, It Can Be Shared With This Module Without Removing The Reverberation Circuit. 4. Note: The Electronic Sound Effect Does Not Have Reverberation, Which Is A Function Limitation Of The Chip. The Volume Of The Effect Can Be Turned Up Or Down But Cannot Be Turned Off Completely. 5. If You Encounter Humming Or Whining Sounds, Please Reconnect The Ground Wire To The Machine Board. Type: DSP Digital Reverberation Karaoke Singing Reverberation Board KTV Mixer Effector Anti-Howling Modification Module Note: Different Batches May Have Differences In Product Appearance, Color, And Printed Characters, Which Will Not Affect The Use Colour:As Shown Material:PCB Package Contents: 1 x Digital Reverb Board Module 1 Set x Wires 2 x Nut Cover Only the above package content, other products are not included. Note: Light reflection 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.