Specifications:Model: 301EFeature:- Excellent sound quality with D.S.P solution for echo cancellation.- Noise suppression(CVC).- Support USB disc and SD card.- Apply to USB devices and MP3 player.- Support MP3/WMA music format. - Transmitter powered by 12V car socket and remote powered by 1 - CR2025 battery(1 x CR2025 battery NOT included).- Give a variety of smart phone charging.- Transmit the audio wireless to the radio.- Swivel axis design、 easy to use.Bluetooth Version: 3.0Frequency Response: 20Hz-15KhzTransmission Frequency: 87.5-108MHzSupported Format: MP3、 WMAUltimate Operating Voltage: 9-26VSNR Ratio: > 60dBLeft / Right Channel Separation: > 60dBMic Range: 0-2mAudio Distortion Degree: 0.1%Power Consumption: 1WRated Operating Voltage: 12VWork Temperature: -20-50 degreeBluetooth Transmission Distance: 10-15mColor: BlackDimensions: Approx 110 x 40 x 30mPackage Include:1 x Hands Free Car Kit FM Transmitter1 x Remote Controller