Plug and play: Installed via CD charger port, simple and fast, ly match. Support hands-free phone calling(HFP): supports answer/hang up etc. via car radio buttons and steering wheel buttons. Support A2DP playback: easily streaming music of bluetooth devices into factory car stereo system. Bluetooth AVRCP control technology: You can use the car audio host (or steering wheel) to control song selection /prev/next track,pause,fast forward/backward Hi-Fi sound quality: Connected to car stereo via wire harness, no interference and no loss of sound quality, rivaling CD sound. Name: 12V Car bluetooth AUX Adapter Microphone Handsfree+Music Disc Box For Power supply: 12V car DC Voltage Input:11V-14.6V DC Operational current: 600mA Standby current: 20mA Frequency response: 20Hz to 20kHz, +/- 2dB Power: less than equal 5W Distortion: 0.01% Signal to noise ratio: 95dB Working temperature: -35Celsius-85Celsius colour:Black Material:plastic Package Contents: 1 x bluetooth connection module 1 x Harness for the disc box 1 x Microphone 1 x Manual Only the above package content, other products are not included. Note: Light 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.