ProShot Camera Tray and Dive Light

With an internal width of 10 inches between its arms, this rugged stainless-steel camera tray is designed to work with underwater smartphone housings. It includes a GoPro mount, lanyard and two cold shoe adapters. ProShot dive lights (sold separately) are depth-rated to 40 meters/130 feet. They provide up to 700 lumens apiece and include three color filters.

$119.99 (tray), $84.99 (light); proshotcase.com