... T receiver are option 1.Special car dvd player for Audi A4 2.2 din iso in-dush dmounting ... cd-r,cd-rw, fm,am,4x40w amplifier,6.Front usb ,ipod,sd,aux port.7.Radio receiving:high sensitive fm ... two video output,two video input (one video input for rear view system )12.4-ch rca output 13. ... 6v 15.Rds function 16.Touchscreen panel 17.Ipod can charge up when it playing ipod or iphone.18.Support chinese, ...