MB-D10 Multi-Power Battery Pack for D700 & D300 includes MS-D10EN for use with EN-EL3e battery (sold separately), and MS-D10 for use with 8 AA batteries (not included).
Extends autonomous operating time. It enables seamless switching between power sources, and is equipped with a shutter release button and command dials for vertical shooting.
The grip is equipped with a vertical grip shutter button, dial, AE lock / FE lock button, and AF point selection button to enable shooting in the same fashion as a horizontal grip.