The Canon DR-E12 DC Coupler When used in conjunction with a compatible AC adapter allows you to power your Canon EOS M Digital Camera directly from an AC Power source. This is a preferable means of powering the camera when shooting in a studio environment, when shooting tabletop product photography, or any photo situation where the camera may need to be powered up for long periods of time.For EOS M10, M Requires: Canon AC Adapter CA-PS700