Required when using EH-5a AC Adapter with select Nikon cameras.
The EP-5B power connector is required to connect the EH-5b (100V) AC Adapter to select Nikon cameras to operate the camera utilizing the AC Adapter.
The EP-5B is required when using the AC adapter EH-5/EH-5a to power the camera.
Simply insert the EP-5B into the battery chamber, powering the camera by continuous AC power instead of the EN-EL15 rechargeable battery.