Canon ACK-E4 AC Adapter Kit for Canon 1D Mark III DSLR
Canon ACK-E4 AC Adapter Kitfor Canon EOS-1Ds Mark III, 1D Mark IV, and ID Mark III SLR Digital Cameras.Recommended to power a camera for an extended period of time or when connecting to a computer. The plug at the end of the DC coupler's cord connects to the AC adapter's terminal and prevents accidental disconnection.