1. Wireless transmitter phone call from mobile phone to car FM stereo system
2. Switch to hands-free mode automatically from music playing status when receiving call
3. Built-in microphone
4. Support music playing from USB disk / micro SD card
5. Detect and display the voltage of car battery when power on
6. Music Format: MP3, WAMA
7. BT protocol: A2DP, HFP, AVRCP