Bluetooth answering / hanging up / rejecting / redialing, etc; Support Bluetooth stereo music playing. Support vehicle battery voltage detection; Support RGB light display; Digital tube display screen; Support mobile navigation voice prompt; Support 5V / 3.1a mobile phone charging; Support charging identification; Automatic power off memory function. Support U disk TF card playing (max64g); Support mp3 / WMA / WAV / FLAC / APE format music. Support FM full frequency point transmission function 87.5-108.0MHZ. Rated working voltage: 12V ~ 24V; The limit working voltage is 8-32V. USB1 output: 5V / 1A; USB2 output: 5V / 3.1A. Working temperature Less than 70 Celsius ; Frequency response 20Hz-20KHz; more than the 60dB Bluetooth version: 5.0; Bluetooth transmission distance: Less than 10m; Effective distance of Bluetooth microphone: 0.5-2m. Colour:black Material:ABS Size:13.4 x 6.5 x 4.1 cm Package Contents: 1 * Car 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.