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 technology3. Support external U disk. Support MP3/WMA music format files. Automatic power-off memory function. Direct car lighter to take power4.Bluetooth :ATS5.0. Bluetooth hands-free calling5.Support Bluetooth stereo music DSP technology. Battery voltage detection.Parameter.Rated working voltage:12V-24VUSB output:dual USB output 5V/1A+QC3.0 fast charging working temperature 0-60 degreesSignal to noise ratio: 60dBDistortion: Less than 0.1%Frequency response:20Hz-15KhzLeft and right channel split: 60dBBluetooth version:ATS5.0Bluetooth sound processing function: A2DP (Advance Audio Distribution Profile)Bluetooth transmission distance: Less than 10MBluetooth microphone effective distance:0.5-2MFM transmitting frequency:87.5-108.0MHZMaterial: Plasticcolour: BlackPackage Contents:1 x Bluetooth in carOnly 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.