Features: Easy to install and use, directly plug and play. Support USB, AUX or AUX MIC-input adapter ( USB support up to 8GB not included ) bluetooth-compatible handfree function ( AD2P ) Answer or reject call phones by press track +/-. Integrated bluetooth-compatible car Interface adds Hands Free Calling and Wireless Audio to the original factory stereo of many car. The system comes with built-in bluetooth-compatible and microphone. Use your phone in the car hands free (HFP), stream your music from your phone to the factory stereo via bluetooth-compatible Audio playback (A2DP). Specifications: Material:Plastic Size:Approx.7x4.5x1.5cm/2.75x1.77x0.59inch Color: Black Standby Current: 3mA Operational Current: 300mA Total Harmonic Distortion: Less than 0.05% SN Ratio: 90dB Voltage-input: 11V-14.6V Supporting decoding format: WAV /MP3/FLAC (lossless format). Support external connection: 1 USB2.0 /AUX Bluetooth-compatible version: 5.0BR/EDR-(including compatible version-below 5.0) Distortion: < 0.05% Standby power consumption: > 0.1W Working power supply: DC11-15V (generally from the host computer, no external power supply is needed). USB output: DC5V/300mA. Working temperature: -20~70℃ Frequency response: 20-20KHz For Package Includes: 1x Module Unit 1x Wire Harness 1x Mic-Cable note: ①.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. ②.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thanks for your understandings.