QCC3031 APTXHD Module Audio Input LINE-in Lossless HiFi Bluetooth 5.1 Receiver compatible withModified Speaker DC5V(4.5-5.5V)

With DC isolated power supply: suitable compatible withmodifying speakers, amplifiers, and adding Bluetooth functions to cars to solve common ground current sound and noise. When using TWS compatible withboxes: the highest protocol APTX. Clear TWS pairing information: the highest protocol APTXHD (3031 default) Qualcomm 5.1, AAC/APTX/ATPXHD, power on, TWS compatible withboxes, AUX audio input,Support IPEX generation antenna, with mobile phone volume synchronization, support serial port AT commands (115200) Support Android APP to modify Bluetooth name (support any language), pairing password, custom EQ, switch prompt tone. KCOM is the common end of the button, and the other end of the button is connected to VOL+, VOL-, N/V+, P/V-, PLAY. Button "VOL+": short press to increase volume, long press to increase volume; "VOL-": short press to decrease volume, long press to decrease volume; "N/V+": short press to next song, long press to increase volume; "P /V-": short press to play the previous song, long press to reduce the volume; "PLAY": short press to play/pause Special function "PLAY": long press compatible with3 seconds and release to force entering pairing mode, long press compatible with6 seconds and release to clear the pairing list "PLAY"+"VOL+": long press compatible with1 second at the same time to enter the host mode to search TWS (with a prompt sound) "PLAY"+"VOL-": long press compatible with1 second at the same time to enter the slave mode TWS is searched (with a prompt sound) "VOL+ "+"VOL-": Press and hold compatible with1 second to disconnect TWS "N/V+"+"P/V-": Press and hold compatible with6 seconds at the same time and release, clear TWS pairing information and pairing password, reset (with prompt sound) MODE/TWS key: Bluetooth is not connected to the mobile phone: Short press, host mode search TWS (with prompt sound); Double click, slave mode TWS is searched (with prompt sound); Press and hold compatible with6 seconds and release, clear TWS pairing information, clear pairing password, reset (with prompt sound). After Bluetooth is connec