CSR8645 V4.0 Amplifier Board Module AUX APTX 2*5W For DIY BluetoothUS,For DIY BluetoothUS CSR8645 V4.0 Amplifier Board Module AUX APTX 2*5W,0 CSR8645 Amplifier Board 5W 5W APT-X Stereo Receiver Amp Module, CSRA64215 supports APTX, APTX LL; CSRA64210 does not, No difference, CSRA64215 APTX APTX-LL,"CSR8645 APTX, DC Model:CSR8645, 1X Bluetooth 4, 2*5W For DIY BluetoothUS CSR8645 V4.0 Amplifier Board Module AUX APTX.