I am fully disappointed by the key finder. The signal is too weak. Continue as about 1.5 meters I can from Do not remove the signal transmitter, otherwise the receiver remains silent. If you put the receiver behind a door reduces the range even more. Since then makes the entire unit no longer makes sense. And although in the description of a range was up to 30 meters indicated. Then I ask myself whether the already conscious customers deception. And the kicker is that the part you can not return it because it is battery powered, and not allow any safety regulations.