The Pixel Vertax series of battery grips delivers a vertical shutter release, shutter and aperture control wheels (Nikon models, single wheel for Canon), exposure lock, and multifunction control buttons. They use AA batteries (alkaline or rechargeable) or camera batteries, for added shooting capacity.
Vertax battery grips are made from the same raw materials that are used on the cameras and include dust and moisture seals. The rubber handgrip provides slip-free handling and control.
In addition to battery grips for current cameras, Pixel introduced battery grips for the Nikon D600 and D800 and the Canon 5D Mark lll and EOS 6D.
All Pixel products come with a two+one-year U.S. warranty. argraph.com