This Olympus PFCA-01 Fiber Optic Cable Adapter is compatible with many Olympus point & shoot underwater camera housings including the PT-045, PT-047 and PT-048. The adapter has 1 built-in fiber optic cable port that positions the cable directly in front of the camera's built-in flash. This will fire your external strobe when your camera's built-in flash fires. The adapter also blocks the camera's built-in flash from your subject. This helps prevent backscatter.