Description: Bluetooth hands-free calling. Support Bluetooth stereo music DSP technology. Dual USB charging port maximum output 5V/3.1A. Support cellphone, tablet charging. Support stereo FM transmission technology. Support U disk / memory card (card ont included) lossless music playback ( FLAC / WAV / APE) (max 32GB). Support MP3 music format files.Support to transfer music to car audio playback through 3.5mm audio space. Direct car cigarette holders take electricity. Automatic power off memory function. Battery voltage detection. Suitable for all types of vehicles. Specification: Material: ABS Size: Approx. 10x4.5x3.5cm/3.94x1.77x1.38inch Bluetooth version Version5.0 Rated working voltage 12V-24V Extreme working voltage 8-27V USB output dual USB output 5V/3.1A Working temperature 0-60 degrees Voltage detection accuracy +_1V Signal to noise ratio >60dB Distortion<0.1% Frequency response 20Hz-15Khz Left and right channel separation degree>60dB Bluetooth sound processing A2DP (Advance Audio Distribution Profile) function Bluetooth transmission distance is less than 10M Bluetooth microphone effective distance 0.5-2M FM transmission frequency 87.5-108.0MHZ Package Includes: 1 Pieces Car FM Bluetooth Tansmitter 1 Piece AUX Cable 1 Piece Instructions