1. Used for DIY sound modification,can make your speaker and headphone upgrade to be high class Blutooth audio equipment with Wireless bluetooth music receive 2. Support wireless bluetooth audio receiving 3. Support USB and TF card play,support WMA/MP3/WAV decode 4. Support AUX input 5. With EQ sound effect function 6. Compatible for bluetooth 3.0/4.0 and 4.1 version 7. Support HSP/HFP.Support bluetooth hand-free call function 8. Support communication with Android APP through SPP protocol 9. Support L2CAP/A2DP(AVCTP/AVDTP/AVRCP) 10. Easy pairing, support automatically connect back, low power mode, sniff mode, stop mode 11. Size: 48mm x 60mm 12. Connection speakers are not supported.