1. Plug and play: Use the original car audio host's disc box interface to install in place, simple and fast, and integrate perfectly with the original car. 2. Support HFP Bluetooth hands-free calling: You can control the operation of answering / hanging up the phone through the original car audio host and the steering wheel buttons. 3. Support A2DP Bluetooth music player: Bluetooth device audio can be easily played through the original car audio 4. Bluetooth AVRCP control technology: You can use the car audio host (or steering wheel) to control song selection / fast forward / rewind / pause, easy and safe control. 5. High-fidelity sound quality: The Bluetooth host is output to the car audio through a wired connection, eliminating any interference and sound quality loss, and the sound quality is comparable to CD. Product Description: Input voltage: 12V DC supports HiFi, A2DP, AVRCP and HFP Frequency response: 20Hz to 20kHz, 2dB Frequency Range: 2.402~2.480GHz Distortion: 0.01% SN Ratio: 95dB Integreated intelligent voice noise reduction tenology to reduce for and noise Support Button control on radio/steering wheel For For A3 8L 8P A4 B5-B7 A6 4B A8 4D Installation Guide Power off the car, remove the radio plug the device into the CDC port ( at the back of radio ) For Bluetooth, plug the included MIC phone into the device and fix the microphone on a good position. then open the BT in your mobile, After connecting, turn on your radio and CD/AUX to switch to the aux adapter, Then you could listen the music from the , Control the music from the audio button by pressing DISC +/-, TRACK +/- Color: As Shown Material: plastic Package Contents: 1 x bluetooth module 1 x bluetooth microphone 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.