The Pentax D-BG2 Battery Grip offers additional power to ensure maximum shooting performance for the K10D & K20D cameras while it's in continuous use. The grip atttaches a second, high-capacity D-Li50 Li-Ion battery (sold separately) to the camera, and features as well an additional shutter release, an adjusting dial for selecting aperture or shutter speed, and other functional controls - making it particularly practical when shooting vertically. The ergonomic design of the grip ensures that the camera fits firmly and comfortably in the hand, and is weatherproof - like the K10D & K20D cameras themselves. Furthermore, the battery compartment provides storage space for an extra memory card and a remote control.