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CMS-XML QuickGuide to Canon 270EX II Speedlite Features
The receiver ID is set to group A and cannot be changed to group B or C. ... AF- Assist Beam
CMS-XML QuickGuide to Canon Integrated Speedlite Transmitter Operation
3. Press the Zoom button again until the "SLAVE" and ID number blink. Use the + or – buttons to dial-in group A, B or C. Press the Speedlite SET button to complete.