... inputCompatible with DVD/VCD Player/Security System/Navigation system/Rear view cameraInfrared remote controlyesDifference from 619AH and 619AHT619=7inch, A=AV ... ,HDMI input; T=TouchscreenAuto Video Switch (No Camera)NO (Default). It means 619AH auto-switches to rearview ... ,and connect it to a car rearview camera, Please choose "Auto Video Switch (No Camera)", $5 more .Auto-Power OnIt means ...