The Car Bluetooth is designed to receive music from mobile phones or transmitters that feature Bluetooth wireless technology. Bluetooth can be used with almost any audio receiver with an audio input jack, including automobiles. Listen to music from your smart phone or Tablet or Mp3 player on your existing home or car audio system . The use of smart phones to make calls and listen to music through the car stereo. The product is embedded echo cancellation microphone.Using only one button !!! you can easily switch between music and phone.