This is the Sealife Super Macro Close-Up Lens for Micro HD/HD+ and Micro 2.0 Close Focus 3.5″/8.9cm

Capture sharp macro images and videos with SeaLife Micro cameras. The Super Macro Close Up Lens captures macro images and videos from 3.5″ to 7″ (9cm to 18cm). The lens features a 2-element optical grade wet lens with anti-reflective coating and anodized aluminum construction with rubber press-on lens mount. Includes two (white) removable focus distance sticks (4.75″/18.7mm), safety lanyard and protective pouch.”