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I have been using a couple of the eBay $10 versions for a couple of years without problem. They are on slightly different frequencies so they don't affect each other, but do have small slide switches on each receiver and transmitter pair so you can tweak the frequency if you do get any interference. The transmitter is only active when you press the button to release the camera shutter so any stray interference would be minimal if noticeable at all. I could never go back to a corded remote.(well maybe a laptop cord)
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