Support Bluetooth to answer, hang up, refuse to answer, redial, etc. Support Bluetooth stereo music playing; Support u disk TF card play (max64g); Support MP3/WMA/WAV/FLAC/APE format music. Support seven color atmosphere lamp display; Digital tube display screen; Automatic power off memory function. Support vehicle battery voltage detection; Support FM full frequency point transmission function, frequency: 87.5-108.0mhz. Support 5V / 3.1a mobile phone charging; USB port supports 5V / 1A mobile phone charging; Support mobile navigation voice prompt; Support charging identification. Parameters: Rated working voltage: 12V ~ 24V; Limit working voltage: 8-32v Usb1 output: 5V / 1A; USB2 output: 5V / 3.1A Working temperature: Less than 70 Celsius; more than the 60dB; Frequency response: 20Hz-20KHz Bluetooth transmission distance: Less than 10m; Effective distance of Bluetooth microphone: 0.5-2m model:F2 Colour:black Material:ABS Size:13.4 x 6.5 x 4.1 cm Package Contents: 1 * Transmitter Only the above package content, other products are not included. Note: Light 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.