Function 1. Radio frequency transmission function, built-in speaker. 2. Support SD card, U disk (audio/video/) 3. Bluetooth function 4. Wired mobile phone screen mirroring, wired and wireless Android AUTO/CarPlay 5. Back function (excluding camera) System: Radio transmission frequency of the entire system: 87.5~108.0 MHzFM output power: built-in 1W speaker working voltage: 12~24V Bluetooth version: version 5.1 (default name: CarPlay) wifi frequency: 2.4G/5G dual-frequency GPS signal: not supported running memory: 1Gbit DRAM support: mobile phone interconnection, reversing, Built-in speaker Audio: MP3/AAC//OGG/:M4A/RA/WAV Video format: H263/H264/H265///MKV HD//MPEG/MP4/WMV9////QT: JPEG/PNG/BMP/GIF /Supported languages: English, Spanish, Portuguese, Russian, French, Polish, Italian, Japanese. Material: ABS Color: Black Package contents: 1 x 1 cable 1 x suction cup holder 1 x remote control (2 AAA batteries not included) 1 x reverse video cable 1 x English instruction manual only contains the above packaging contents and does not include other contents. Note: Light reflection and different monitors may cause the color of the item to differ slightly from the actual item. The measurement allowance is +/- 1-3 cm.