This karaoke board utilizes the PT2399 reverb chip and NE5532 operational amplifier for optimal mixing of vocals and music. Independent adjustment of music volume, microphone volume, and reverb time allows for a customizable karaoke experience. Compatible with DC 12-24V or AC 5-12V power supply, making it versatile for various setups. Can be directly used with various digital amplifier boards, allowing for shared power supply if voltages match. Only dynamic microphones are compatible; other types such as condenser, electret, and headset microphones are not supported. Product Name: Karaoke Reverb Board Input Voltage: DC 12-24V Reverb Chip: PT2399 Microphone Inputs: 2 Knob Spacing: 24MM Microphone Spacing: 17.6MM Output Channels: 2 channels Frequency Response Range: 25Hz-17kHz Due to different batches, there may be differences in product appearance, color, and printed text, which will not affect the use. Color: As Shown Material: PCB Package Contents: 1*Reverb Board Kit 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.