Strong Functionality: Convenient and Idea For Short Or Long Haul Driving (rear view mirror). Features: Bluetooth Specification: 2.0 range: 0-10m Easy to installation and no need to remove the original rear view mirror Independent FM wireless earpiece to protect your secrets Independent MP3 Player module with 3 in 1 Cardreader solt and USB solt 35 seconds record and play function Super bright LED caller number display Complete bluethooth wireless installation DSP technology, Full Duplex, Noise and Echo suppression With 1800mah Lithium battery to provide typical standby time of more than 100 hours talking time of 8 hours and headset talking time of 5 hours. Voice dialing, last call redialing and call switching function Built-in high intelligent microphone and powerful fidelity speaker Transmit the signal into car radio by FM frequency USB interface to software framework update Support English, Chinese MP3 ID3 Suporting 4GB USB Suporting 4GB SD/MMC Memory Card Music Resume playback Call preference, MP3 second As a Mobile recharger by USB solt Automatic playback Dimensions (W x H x D): 9.2 W x 2.0 H x 28.0 D cm