517-8604-02 is a part number from the Concord brand, more specifically a Concord 4 Series Security System Kit. This kit includes a four-zone control panel, one keypad, a transformer, a backup battery and various mounting screws and accessories. The kit also comes with an installation manual, programming manual and a warranty card. Additionally, this kit can be used to control up to four door or window sensors, or up to four camera systems.