The Canon DM-E1D is powered by your camera through the new multi-shoe adapter. When used with your R3, enjoy crisp audio without the need for wires or worry about battery replacement.
The DM-E1D allows you to shoot in a noisy environment without recording too much ambient noise. With 3 types of directivity - Shotgun, 90˚ and 120˚, there's a setting for most environments.
The Canon DM-E1D only has one button at the back of the unit, allowing all settings to be easily managed from the camera screen.