Car Bluetooth FM Transmitter + USB Car Charger with Voltage Display Features: 1.FM transmitter 2.LED display window 3.LINE audio input 4.Independent Bluetooth start /shutdown button 5.Support playing music by USB disk 6.Support MP3/WMA music format 7.Answer /hang up/reject/redial via Bluetooth 8.Bluetooth stereo music play 9.Call Echo Cancellation and Noise Reduction(CVC) 10.USB output voltage, provides power to other devices up to 5V/2.5A 11.Automatic memory function of power failure frequency point 12.Display of on-board battery voltage Parameters: Material:Engineering plastics Rated working voltage:12V-24V Limit working voltage:9-262V USB output:2.5A Working temperature:0-50C Play format:Mp3 WPA SNR:>60dB Degree of distortion: Frequency response:20Hz-15 KHz Bluetooth version:2.1+EDR Bluetooth sound processing:A2DP (Advance Audio Distribution Profile)function support Bluetooth transmission distance:10M Effective distance of Bluetooth microphone:0-2M FM frequency:87.5-108 MHz FM mode:Stereo digital PLL frequency locking Packing list: 1 x Car charger 1 x USB charging cable 1 x English user manualCar Bluetooth FM Transmitter