The MB-D10 multi-power battery pack increases the maximum frame advance rate to 8 frames per second & extends autonomous operating time when using batteries. It is ergonomically designed for enhanced grip with the camera in the vertical shooting position & is powered by eight AA-size standard batteries or the EN-EL3E battery (listed under accessories above). Features alternative shutter-release button, multi-selector & AF start buttons for use when holding the camera in the vertical shooting position, as well as secondary main- & sub command dials.