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I purchased it at a TSC store in Ontario Canada last fall. But I have sesen the same units in the US as well.

I posted an answer to same question for pungoyaker. BUt the key steps are, remove batteries from inside and outside units, plug in inside unit and get flashing IO. With swtich in normal position put...

I have same unit, no web site only phone 1-800-387-8520. But to reset, need to turn on inside unit, without batteries, get flashing IO. Then put batteries in outside unit with switch in normal, then...