Shop name:Chong Qing Shuo Yue Ke Ji You Xian Gong Si 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 format 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 Profile) 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.