3034 uses qcc3034 Bluetooth solution, version 5.0. Support: AAC / / A2DP / / -ll / -hd protocol The following description is the description of the csr64215 Bluetooth solution. The motherboard is universal, so the description is also universal. 1. DC power input interface, GND for the power supply negative, +12 V for the power supply positive. Wide voltage: 6-36V 2. AUX audio interface, LINE_INR right channel input, GND common ground, LINE_INL left channel input 3. Audio output interface, R_OUT right channel output, GND common ground, LINE_OUT left channel input 4. Audio switching relay, original-import 5. Bluetooth antenna for receiving signals 6. Bluetooth work light 1 7. Bluetooth work light 2 8. CSR8645 Bluetooth program, support APT-X lossless signal reception. CSR8645 Bluetooth receiving module support the agreement:APT-X, A2DPv1.3, AVRCPv1.6, HFPv1.6, HSPv1.2, D1V1.3 Color:Black Material:ABS Package Contents: 1 set * Bluetooth module QCC3034 CSR8645 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.