The nikon eh 6b ac adapter is designed to enable your digital slr to run off the mains instead of using battery power the eh 6b can be used with ac power sources of 50 60 hz and 100 240v compatible with the nikon d2h d2x d2xs d3 d3s d3x d4 d4s and d5 digital cameras the eh 6b ac adapter is an ideal way to avoid constant battery changes during long shooting situations or for when you are downloading images to a computer the nikon eh 6b requires power connector nikon ep 6 available sep