Features: Bluetooth 2.0+EDR, compatible with ALL bluetooth enabled mobile phones Caller ID indicate with large LED lights Voice dial and last number redial Noise suppression and echo cancelation technology AVRCP profile integrated, control the audio playback when used with Bluetooth USB dongle Built-in microphone and built-in dual stereo louderspeaker Built-in FM frequency transmitter connect to your car stereo Universal audio input for audio devices, such as iPods, MP3, MP4 to enjoy wireless stereo listening Stereo earphone provided for total private conversation. FM earpiece is available Wireless parking sensor system is available Easy installation, the mirror simply clips over the top of your existing mirror Specifications: Effective distance between mirror and phone : 8 meters FM transmitter distance : 8 meters Wireless earphone receive distance : 1.5 meters Power Consumption (Max volume,during conversation) : 5W Audio distortion (1KHz/1000mv input) : 0.3% Audio channel separation(1KHz) : 45dB Audio S/N(1KHz/1000mv input) : 50dB Speaker output power (1KHZ/1000mv input,max,volume) : 0.5W Headphone output level (1KHz/1000mv input,32 OHM loading) : 0.8V Mirror size (L* H) : 285 *75 mm