The Canon ANikon EH-5b AC adapter is a power adapter for your Nikon SLR camera. Are you up for a long studio shoot or planning to keep downloading for a while? The Nikon EH-5a sends a constant flow of power into your camera, so you won't suddenly be interrupted. Note, this adapter doesn't charge the camera. For use of the EH-5b with the Nikon D40(x), D60, and D5000, you need the Nikon EP-5 Connector.