connection method: Power on the two products, when Bluetooth is not connected, and the USB flash drive and AUX are not inserted! and hold the microphone volume adjustment knob of one of the products for more than 3 seconds, and the red indicator light starts to flash, indicating that it is looking for a matching pair. After the pairing is successful, the indicator of the product is always on, indicating the left channel, and the indicator of the other product flashes for the right channel. After the pairing is successful, the pairing function can work normally in Bluetooth, USB flash drive, and AUX modes. cancellation method: and hold the microphone volume adjustment knob of one of the products for more than 3 seconds, and the red indicator light goes out, indicating that the function has been canceled clear pairing record: After pairing, the host and the slave record each other, making it difficult for a third party to pair successfully after entering, and the code needs to be cleared once. and hold the music volume adjustment knob for more than 3 seconds to clear the pairing record Note: In mode, only the host emit the microphone sound; in mode, due to limited resources, the USB flash drive freeze when decoding FLAC and APE songs, and there is no such problem in non- mode Product name: Isolated low-noise structure upgraded version of karaoke reverb board Product model: -DAM H2 Input voltage: wide voltage 8-36VDC, no AC input 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, U 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. Due to different batches,there may be differences in product appearance,color,and printed text,which not affect the use. Specifications:B:Without Case Color:As Shown Material:Metal+Plastic Package Contents: 1 * Reverberation 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.