DSC PC500RK Keypad Classic for PC500 4 Zone Alarm RARE Used. We Don’t Use Stock Pictures in Any Our Auctions, Please Check the Pictures Thoroughly Shows Exactly the Item for Sale. DSC PC500 4 Zone Alarm Pc500RK Keypad Classic RARE with printed manual Used. All sales are final. Boxes, APO, or FPO.. NOTE: Please note that we keep track of all S/N numbers of each and every tool.