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: SBC, 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 TWS, red light flashing to search for pairing, red light constantly on TWS left channel, red light slowly flashing TWS 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:A: With shell version Package Contents: 1 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.