Battery Grip D-BG8This battery grip is designed for the PENTAX K-3 Mark III, which uses a dust-proof and splash-proof construction. Similar to the camera body, it features a shutters, smart functions, adjustment point lever, AF/AE lock, exposure compensation, green buttons and electronic dial, making it easy to take vertical position. The power supply is the same as the "PENTAX K-3 Mark III" main unit, and the large capacity rechargeable lithium ion battery (D-LI90P). When it is attached to the camera, you can use the USB port on the camera body.(Battery Grip for the PENTAX K-3 Mark III) Improved hold when shooting vertically and greatly increases the number of photos possible.Battery Used: Rechargeable lithium ion battery D-LI90, D-LI90PAbout Battery Charging: The battery inside the battery grip can be charged with the battery grip attached to the camera. In that case, it will be charged from the battery of the person who has set priority in the camera settings menu "Battery Grip Setting". When charging the battery on the camera side, it will flash twice consecutively every 5 seconds and 3 times continuous when the battery grip side is charged.About the battery: The battery can be used by either the camera or the battery grip.[Dustproof and Splashproof Construction] The buttons and body joints have been treated with dustproof and splash-proof processing.Dimensions and Weight: Approx. 5.3 x 1.9 x 2.9 inches (135 x 48 x 74.5 mm); Approx. 9.8 oz (275 g).Included Items: Battery holder, contact pin cap.