Another key to signal strength and grounding. Do not plug the command base into a surge protector as that may interfere with the signal strength. An extension cord may be OK, but best to make sure you have a good connection by checking on the outlet and plugging the wall wart directly into the outlet. If you have an older house (before the 1970s and 1980s in particular) your outlet may not be properly grounded if some people's experience is correct.
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