19[7] NTSC/ PAL:Select this menu item to set up your preferred video output format. PAL is commonly used inEurope, NTSC is commonly used in the USA and Japan. Auto is commonly used.[8] DEFAULT:Factory reset. Set all values to Factory defaultvalues including memory and preset stations.SYSTEM INFORMATIONPress SYSTEM button to show the information ofthe system. You can view detail system informationincluding serial number of the software.CALIBRATIONThe calibration of the screen is useful when somemalfunction occur with the touch screen and itneeds adjustment.CALIBRATION procedure of the touch screen isdescribed as below: When the target moves toanother position, tap and hold at the center of thenew target. Repeat each time to complete thecalibration process. When the calibration has beencompleted, the device switches back to the previousoperating mode and retain the previous setting. Ifyou press Reset button, the setting will return tofactory setting.Other functionsSubwooferConnect the subwoofer to the unit using sub output (see electrical diagram). Tap MENU onscreen enter into main menu setting choose setting menu. Choose SOUND and set subwooferON to enable subwoofer.ParkingWhen the car is stopped and the parking brake is working, the screen can display the videoimage, otherwise the screen can't display the video imageBack View CameraThis unit is equipped with back view camera output. The camera is used to observe thesituation behind the vehicle when you are backing the car.Please connect your back view camera with the back car video input. And connect the reversewire for back a car with the rear gear light. Rear view camera picture will be enabled when youare backing the car.