Canon AC-E4 AC Adapter (100-240V) Requires DR-E4 Coupler

The Canon AC-E4 AC Adapter is designed to supply uninterrupted power for your camera while downloading pictures to your computer, for extended work in a studio, or while viewing images while connected to your TV or VCR. With the DR-E4 Coupler (not included) it compatible with EOS 1D Mark III, IV, EOS-1Ds Mark III, and EOS-1D X SLRs.