Handsfree talking, safe and convenient. MP3 with 1.5 inch LCD screen, MP4 with 1.5 inch high resolution TFT screen. Support the remote control to dial or pick up telephone. When telephone cpming, the music automatically cut over to telephone coversation condition. Broadcast music stored up by the device through car stereo system. Stereo Bluetooth and FM transmitter technology. Support SD/MMC card. Support MP3/MP4 music format. Automatic last memory. 21 keys remote controller and steering remote controller. Rated voltage: 12V-24V. Rated current: 90mA. Limitted voltage: 9-26V. Support file format: MP3, MP4. Bluetooth voice with AD2P. Transmit distance: 10M. Bluetooth microphone effective range: 0.5 -2M. Transmit frequency: 87.5-108MHz.