Top-Navi Car DVD GPS Player for Mercedes Benz C class W203 radio USB 3G wifi host S100 Support DVR Audio Video V-20 disc changer memory(20 disc music can be memory in the unit while you listening the music) 2. Picture ON Picture fucntion Picture ON Picture fucntion.All keys with red green colors adjustable, match your original car perfectly. Three Zone function, listening to Radio/watching GPS image in the front and watching DVD/USB/SD/TV from the back Monitor synchronously Built in 4G Flash Sumsang CPU 1G MHZ, DDR: 512MB Support Bluetooth, phone book ,3G modem , camera and parking sensor