Product name: Isolated low-noise structure upgraded version of karaoke reverb board Product model: ZK-DAM H2 Input voltage: wide voltage 8-36VDC, AC input is not allowed Bluetooth chip: Mountain View BP1048B2, Bluetooth 5.0 Bluetooth decoding format: SBC, 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 TWS, the red light flashes to search for pairing, the red light is always on for TWS left channel, and the red light flashes slowly for TWS 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: B:Without shell / 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.