This is a power battery holder for the "OLYMPUS OM-D E-M1" which is dustproof and splashproof. When combined with the main unit and the HLD-7 total of 2 pieces stored in the HLD-7, you can take approximately 680 photos (CIPA test standard). In addition to the shutter button for portrait shooting, it also features 2 control dials and 2 function buttons to ensure good operability as it was when shooting in landscape position. By separating the battery portion and the grip parts, it can also be used as a grip with high holding properties. You can also use the grip strap "GS-5" (sold separately) and the AC adapter "AC-3" for long continuous shooting.