Fangrui Product Details 1.support Fm Full Frequency Transmitting Function 87.5-108.0mhz 2.support Dot Matrix Screen Display 1.3 Inch 3.support U Disk Playback Function 4.support Tf Card Playback Function 5.bluetooth Answer, Hang Up, Refuse To Answer, Redial Calls And Other Functions Rated Working Voltage:12v-24v Limited Working Voltage:8-27v Usb Output:dual Usb Output 5v/3.1a Operating Temperature:0-50 Degrees Charge Recognition:usb2 Support 5v/2.1a Voltage Detection Accuracy:+_1v Signal-to-noise Ratio:greater Than 60db Distortion:less Than0. Frequency Response:20hz-15khz Left And Right Channel Separation:greater Than 60db Bluetooth Version:version4.0+edr Bluetooth Sound Processing:a2dp (advance Audio Distribution Profile) Function Bluetooth Transmission Distance:less Than 10m Effective Bluetooth Microphone Range:0.5-2m Fm Transmitting Frequency:87.5-108.0mhz Transmit Fm Mode:stereo Digital Pll Frequency Lock Support Bluetooth Stereo Music Playback Echo Cancellation And Noise Suppression (cvc) Technology When Talking Support