DESC: Anti-Shock Protection: 10 second Shock proof memory to keep discs from skipping, no matter how big the pump 3-Band preset equalizer lets you adjust sound for your car and tastes Adjustable XBASS low frequency EQ for improved deep bass Pre-Amp Outputs: CD changer control and 4-channel preout for system expansion Auxiliary Audio Input: AUX input for integration with satellite tuner, video system, or navigation computer