Advanced DSP Mixing Technology: Experience crystal-clear sound quality with our advanced Digital Signal Processing (DSP) that eliminates noise and enhances vocal clarity. Anti-Whistling Feature: Enjoy uninterrupted singing with our built-in anti-whistling technology that prevents feedback and maintains smooth sound output. High-Fidelity Sound: Our upgraded karaoke reverb board ensures your voice sounds richer and more natural, making every performance memorable. Easy Setup: Designed for quick installation, this board is compatible with various audio systems, allowing you to set up your karaoke sessions without hassle. Durable and Reliable: Built with quality components, our reverb board is made to last, ensuring countless hours of entertainment. Input voltage: DC8-36V, annot input AC Microphone jack: Dual 6.35mm mic jacks Background music input: XH2.54-3P, with a 3P shielded audio cable and XH2.54 connectors on both ends. To connect to a mobile phone or other 3.5mm audio output port, you will need to provide your own 3.5mm audio jack to XH2.54-3P audio cable. Reverb output interface: XH2.54-3P, with a 3P shielded audio cable and XH2.54 connectors on both ends. The output is connected to the audio input of the power amplifier module. If you need an XH2.54-3P to 3.5mm audio cable or an XH2.54-3P dual-ended cable, you must purchase it separately. Color: Black Material: PCB+Metal+Plastic Package Contents: 1* Microphone preamplifier board 1* Marking board 3* Audio cables