Designed for exclusive use with the PENTAX K-3 Mark III, this battery grip features a dustproof, weather-resistant construction, and provides an extra set of control buttons (shutter release, Smart Function, AF/AE lock, exposure compensation, and green), a focus point selector lever, and a pair of electronic dials to facilitate vertical-position shooting. It is powered by the large-capacity D-LI90P Lithium-ion Battery, which is also used to power the camera body. This battery can be recharged using the camera’s USB terminal.