HI . I HAVE A SUGGESTION FOR THOSE OF YOU WITH PREDATOR PROBLEMS IN YOUR COOP.ITS A ELECTRIC DOG.THATS RIGHT.THIS CRITTER CAN ' ' SEE' though WALLS AND DOORS, BARKS LIKE A CRAZED MUTT THE CLOSER YOU GET,SCARS THE WITTS OUT OF PEOPLE AND OTHER ANIMALS.I USED IT IN MY HOUSE .NOW IT LIVES IN MY COOP.THE CHICKENS ARE USED TO IT .BUT I'LL TELL YOU WHAT.IF YOU DIDN'T KNOW IT WAS PHONY.YOU WOULD BE NUTS TO GO IN THERE.BOUGHT IT ON LINE.NOT CHEAP.BUT WORTH IT.HAS A VOLUME CONTROL AND DISTANCE CONTROL. ITS GREAT