Product name: Isolated low-noise structure upgraded version of karaoke reverb board Product model: -DAM H2 Input voltage: wide voltage 8-36VDC, AC input is not allowed Bluetooth chip: Mountain View BP1048B2, Bluetooth 5.0 Bluetooth decoding format: , AAC Bluetooth distance: 15 meters U disk decoding format: MP3, WAV, FLAC, APE, bit rate must be less than 1500kbps. Mic interface: dual 6.35mm microphone interface Power interface: DC5.5-2.1 female socket, or terminal block, choose one of the two Audio output interface: 3.5MM headphone socket, or XH2.54-3P socket, choose one of the two Working mode: Bluetooth, AUX, USB disk/sound card Indicator status: Blue light flashes slowly in USB and AUX mode, Bluetooth connection is always on, and it flashes super slowly when there is no connection. Start , the red light flashes to search for pairing, the red light is always on for left channel, and the red light flashes slowly for right channel Mode priority: Bluetooth can be disconnected by inserting a USB flash drive or AUX, and the mode can be memorized after power failure. Bluetooth cannot be searched in USB flash drive or AUX mode. Dimensions: 80x122x22.2mm Specification: A:With shell Color: Black Material: ABS Package Contents: 1 * Karaoke Reverb 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.