Function 1. Radio frequency transmission function, built-in speaker. 2. Support SD card, U disk (audio/video/picture) 3. Bluetooth function 4. Wired mobile screen, wired and wireless Android AUTO/ CarPlay 5. Backward view function (not including camera) System: The Whole melis system Radio transmission frequency: 87.5~108.0MHz FM Output : Built-in 1W speaker Operating voltage: 12~24V Bluetooth version: Version 5.1 (Default name: CarPlay) wifi frequency :2.4G/5G -band GPS signal: Not supported Operating memory :1Gbit DRAM Support: mobile phone interconnection, reversing , built-in speaker Audio format: MP3 / AAC/APE/OGG / : M4A/RA/WAV Video formats: H263 / H264 / H265 / /FLV/MKV HD / / MPEG/MP4 / WMV9 / /ASF//QT format: JPEG/PNG/BMP/GIF/ Supported languages: English, Chinese, Spanish, Portuguese, Russian, German, French, Polish, Turkish, Arabic, Hebrew, Italian, Czech, Japanese. Material: ABS colour: Black Package Contents: 1 x host 1 x cable 1 x suction cup support 1 x remote control (without 2X AAA battery) 1 x reverse video cable 1 x English Instruction Manual 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.