This is the Watershot Magenta Lens Filter Accessory for the Watershot iPhone Housing Features: Compatible with: Watershot M32 Threaded Lens Port Camera Housings, Watershot Standard F2.4 Flat Lens Port Easy threads onto Lens Port Bezel May be installed and removed in or out of the water Enhances Contrast and Alters Color of Green Water Environments Dimensions: Diameter 1.3 x Depth 0.4" (3.30cm x 1.01cm) Weight: 0.03lbs Magenta Filter enhances contrast and alters color in Green Water Environments (fresh water). The Filter returns the rich, natural tones to your subject. Filters feature M32 thread which easily mounts to the Lens Port Bezel on the Watershot PRO & Dive Housings. Filter can be installed and removed in or out of the water (wet-mate or dry-mate). "