Features.1.For all kinds of vehicles.Digital tube display, aluminum alloy knurled bezel design. 2.Dual USB charging ports with a maximum output of 5V/1A + QC3.0 fast charging 18W.Support phone and tablet charging.Support stereo FM transmitting technology 3.Support external U disk.Support MP3/WMA music files.Automatic power-off memory function.Direct car lighter to take power 4.Bluetooth :ATS5.0.Bluetooth hands-free calling 5.Support Bluetooth stereo music DSP technology.Battery voltage detection. Parameter. Rated working voltage:12V-24V USB output:dual USB output 5V/1A+QC3.0 fast charging working temperature 0-60 degrees Signal to noise ratio: 60dB Distortion: Less than 0.1% Frequency response:20Hz-15Khz Left and right channel split: 60dB Bluetooth version:ATS5.0 Bluetooth sound processing function: A2DP (Advance Audio Distribution ) Bluetooth transmission distance: Less than 10M Bluetooth microphone effective distance:0.5-2M FM transmitting frequency:87.5-108.0MHZ Material: Plastic colour: Black Package Contents: 1 x Bluetooth in car Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing.The measurement allowed error is +/- 1-3cm.