The Pentax D-BG5 Battery Grip is exclusively designed for the Pentax K-3 Digital SLR camera. This optional battery grip accepts six AA-size batteries as well as the standard lithium-ion rechargeable battery (a separate battery tray is included for either option). It provides an extra set of shutter-release, AE-lock, AF, ISO, exposure-compensation and green buttons, as well as a preview lever and dual electronic dials to facilitate vertical-position shooting. It features the same dustproof, weather-resistant construction as the K-3 body.