Product name: Karaoke front-end board with BT and USB decoding Input voltage: Wide voltage range of 8-36VDC, unable to input AC BT chip: Mountain View BP1048B2, BT 5.0 BT decoding formats: , AAC BT distance: 15m USB decoding format: MP3, WAV, FLAC, APE, with a bit rate of less than 1500kbps Microphone interface: dual 6.35mm microphone interface Power interface: DC5.5-2.1 female socket, or wiring terminal, choose either Audio output interface: 3.5MM headphone stand, or XH2.54-3P socket, choose either Working modes: BT, AUX, USB drive/sound card Indicator light status: The blue light flashes slowly in USB and AUX modes, remains on continuously after a successful BT connection, and flashes excessively slowly when there is no connection. Start , red light flashing to search for pairing, red light constantly on left channel, red light slowly flashing right channel. Mode priority: Inserting USB or AUX can preemptively interrupt BT, and the mode can be memorized after power failure. BT cannot be found in USB or AUX mode. Colour:Black Material:Metal+Plastic type:B:Without shell version Package Contents: 2 x Karaoke front-end board 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.