Got it last week, installed it myself to be used by the shop out back. Works great at over 450ft thru a garage door. Haven't gotten a false signal yet and I have 3 dogs! Will buy another one for the house next month. It's cheaper and easier for me to get 2 separate systems then to try to hook up another base station and another sensor. Great little alarm. Can add a louder buzzer if I want, the ringing is a little low for the shop since machines are running but if there was no backround noise, it is plenty loud.