The MB-N10 is a Multi Battery Power Pack for the Z 7 and Z 6 full frame mirrorless cameras (cameras sold separately) It is designed to add additional shooting time versus just using the battery in the camera alone The MB-N10 may increase the length of shooting time up to 1 8x* (*CIPA standard) more than using just the camera?s battery The MB-N10 is designed with the same weather sealing and modern design of the Z cameras and affords photographers a well-balanced feel when a long telephoto lens is on the camera