In case your Mighty Mule keeps moving off (sounding the alert), it’s probably because somebody else in the range has one also. It is a rare company that’s had just one sale in its whole history. I replace the batteries after a year, and it keeps working! Just ensure that the place is apparent once you add the batteries. I am seeking a driveway alarm system (1,000 ft extended lane), which will alarm me by dialing my smart mobile whenever someone moves and read more