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QCC3031 Bluetooth 5.0 Receiver Board, with 5V DC isolation, AUX Input APTXHD Lossless
Without DC isolation: lithium battery power supply, use for Bluetooth headset
With DC isolation: seperat 5V/12V power supply, reduce the current noise. Use for Bluetooth speaker, amplifier, bluetooth car speaker.
KCOM: common key, the other end of the key are connected to VOL+, VOL-, PREV, NEXT, PLY
Note: the connecting cable for key PINs should shorter than 5cm.
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