Regetek Single Din 7 inch Audio Video Player Radio Telescopic Retractable Capacitive Touch Screen Bluetooth 7 single 1din car stereo radio mp5 player gps sat nav eu map + camera hardware electronic sounds (eq) processing, multiple eq modes, treble and bass can be adjusted. Hope you can understand it. Support reverse video input, reversing the priority. Loudness switch, Loud bass reverberation aggravated extraordinary!