This Pistol Grip Shutter Release from AquaTech is compatible with the Delphin 4 and Elite 800 Underwater Sport Housings for the Nikon D4 and D800/D800E DSLR cameras, respectively. It has a depth rating of 33' and is constructed from polyurethane, rubber, and stainless steel. This lightweight, ergonomic grip mounts onto the bottom of the camera and is supplied with all mounting hardware and wiring, including the sensitive shutter release switch/trigger and coiled, extendable cable. It will enable you to capture images without camera shake and will work in both single-shot and continuous shooting modes. For sharper, more consistent photos, using zone focus is recommended when operating the Pistol. The device is powered by the camera, so it requires no battery.