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D-BG4 Battery Grip,
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This review is from: Pentax D-BG4 Battery Grip for Pentax K-7 K-5 K-5ii K-5iis Digital SLR (Electronics)
The D-BG4 battery grip features high quality build and allows you to use either a D-LI90 or AA batteries. Grip is fitted with controls for shutter release, depth of field preview, e-dails, exposure lock, green button and ISO. Very convenient accessory to have if you have large hands or are a composing vertical shot. Like the K-7, it is weather sealed.