... . Built-in microphone 7. Supports 87.5 to 108.0MHz frequency transmission 8. Support line-in, Line out, USB & SD./ ... and background noise reduction Bluetooth interfaceVersion 2.0, Class 2Bluetooth frequency range 2.402 ~ 2.480GHzSupported BT Profiles HSHF, Headset, A2DP, ... FM transmitting range 88.1~107.9MHzOperating voltage range DC 12V~24V (car lighter socket)Charger ...