The MB-D17 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 with the camera vertically oriented.
The MB-D17 Multi-Power Battery Pack can be powered either by eight AA batteries (Alkaline or Ni-MH or Lithium), or EN-EL 15 or EN-EL18a rechargeable Li-ion batteries.
To use the MB-D17 with AA batteries, use the MS-D12 (included) AA Battery Holder.
When using EN-EL15 batteries to power the MB-D17, use the MS-D12EN (included) Battery Holder.
BL-5 battery chamber cover (not included) is required when using EN-EL18A battery.
MB-D17 can also be powered with AC power adaptor using the EP-5B power connector.