This is the OLYMPUS FD-1. It's an accessory for macro photography. I opened the box, but I only attached it once for testing, and haven't used it otherwise. It's practically new. To save on shipping costs, I will fold the box neatly as shown in the photos for shipping. (The box can be reassembled to its original state!) Here's the product description! The FD-1 is an accessory for handheld macro photography. It uses the camera's built-in flash for lighting. It can be used for macro photography in dark places or when photographing moving subjects like insects. You can also use it for underwater photography or to create atmospheric photos by darkening the background of your subject, allowing you to enjoy creative photography that rivals that of a single-lens reflex camera. Furthermore, the FD-1 has a light intensity adjustment lever, allowing you to adjust the lighting by approximately 1.4 stops depending on the shooting situation. Compatible models: TG-7, TG-6, TG-5, TG-4 [1] Usable focal length: 5.5-18mm (35mm film equivalent: 30-100mm) Shooting distance (in microscope mode): 20mm - 300mm Size: Width: 80.6mm Height: 60.7mm Depth: 19.8mm Weight: 20.0g