Product Size96*48*38mmProduct MaterialPlastic + metalMCUAB5303BColorsBlack, Silver, White, RedDisplay0.9 inch LCD(Display Battery Voltage, FM Frequency, Music play list)Button Functions5 functions knob button: FM Frequency Setting, Previous, Next, Volume adjusting, Call AnswerProduct Voltage and functionsInput power:DC12-24V1*USB Output: 5V1A1*5V USB output:5V2AOver-current, over-voltage, shortcut, and over-temperature protection.Car battery Voltage check: Car Battery Voltage voice indication and display.AudioAUX audio output: 3.5MM/Stereo 2.0U-disk and SD-Card reader music supported(MAX 64GB)Audio format::MP3 APE FLAC WAV WMAAudio decode:16BIT /8K/12K/11.025/16K/22.05K/24K/32K/44.1K/48KHZPower off resume playing supportedFM76-108MHZTransmitting Distance:5MBluetoothBluetooth 5.0 compatible with 4.1/4.0/2.1+edrBluetooth Audio PlayingBluetooth Hands-free phone callPhone Call distance: 1.5MAudio receiving distance: 10M