OPTRONICS FISH-N-LITE 2-PACK OF MODULE LIGHTS MODULE ADDITON BULBS FOR THE UW-700L FISHING LIGHTBy adding additional modules, your fishing light can be extended to any length you desire. Simply screw the threaded module ends together, then attach the endcap. THIS PURCHASE INCLUDES ONLY THE 2-PACK OF MODULE LIGHTS. THE UW-700L SUBMERSIBLE FISHING LIGHT IS LISTED ABOVE.