B00NJ0R43O Nikon MB-D16 Multi Battery Power Pack/Grip for D750

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The MB-D16 is equipped with a shutter-release button, AE/AF lock button, multi selector, and main- and sub-command dials for improved operation when taking photographs in portrait (tall) orientation
Can be powered either by six AA batteries (Alkaline or Ni-MH or Lithium) or EN-EL15 rechargeable Li-ion batteries
To use the MB-D16 with AA batteries, use the MS-D14 AA Battery Holder. When using EN-EL15 batteries to power the MB-D16, use the MS-D14EN Battery Holder