Features: Made of high quality material, and practical to use Multimedia car Compatible-Bluetooth (Compatible-Bluetooth) connector , Compatible-Bluetooth supports hands-free answering the phone (can answer / hang up the phone through the car audio host and steering wheel buttons), supports A2DP Compatible-Bluetooth music playback (through the car audio host, steering wheel control selection Song / fast forward / rewind / pause, and support multiple Compatible-Bluetooth devices) Plug and play: Use the car audio host's disc box interface to install in place, simple and fast, and integrate perfectly with the car. Support HFP Compatible-Bluetooth hands-free calling: You can control the operation of answering / hanging up the phone through the car audio host and the steering wheel buttons. Support A2DP Compatible-Bluetooth music player: Compatible-Bluetooth device audio can be easily played through the car audio Compatible-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. High-fidelity sound quality: The Compatible-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. You can just Insert this item to the back radio match your phone or pad to Compatible-Bluetooth module and choose Aux from your radio, then you can use your phone to through car speakers. you can also just use aux in function to paly music 1. Please make sure your car radio has AUX mode before purchasing. This product is only suitable for radios in AUX mode! 2. The without a microphone does not have the function of answering calls, while the with a microphone has the function of answering calls. If you need the function of answering calls, you need to purchase a matching microphone. Specification: Length: 150cm(.) Power Supply: 12V car DC Frequency Response: 20Hz to 20kHz, 2dB Power: 5W Distortion: 0.01% Signal to Noise Ratio: 95dB Working Temperature: -35-85 Color: Black Material: ABS plastic Package Contents: 1 x Compatible-Bluetooth Module 1 x Cable Adaptor 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.