Features: Fixed on the steering wheel with special hool structure which is convenient for fixing and operation DSP technoloy,full duplex,CVC noise and echo suppresion Support TTS function Support MIC mute function Answer/end/reject a call,last call redialing,and call switch Support A2DP function,can play cell phone music and control it completely via Bluetooth car kit Built-in high intelligent microphone and powerful speaker in order to keep excellent sound quality effects Built-in Li-ion Battery USB port for software update and charge Connect automatically when power is on Support dual standby Specifications: Bluetooth version:2.1 Bluetooth working Frequency:2.4GHz Receiving range of the Bluetooth device:0~10 meters Talking range of the hands-free Mic:0~1 meters Charging voltage:5V Capacity of the built-in lithium:300mah External size(LxWxH):98x45x22.5mm Weight:160g Operating temperature:-10~70C Storage temperature:-20~80C Material:ABS Color:black key word:car MP3,vehicle-mounted MP3,bluetooth,FM transmitter,ABS