Ferever mierophone front panel reverb bel canto yIntelligent frequency shift anti whistling + Treble adjustment for high-end experience 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 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 1* HT21 module 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.