If the barking of a neighbor's dog is driving you crazy, use this decorative outdoor bark deterrent to take control. This inconspicuous device looks like a bird house, but emits an ultrasonic sound that deters nuisance barking for up to 50 feet away. The PetSafe Ultrasonic barking dog deterrent. Disguised as a birdhouse, this patented device quickly and humanely restores peace and quiet for those vexed by dog's barking. When a dog barks within range of the birdhouse, it emits a harmless ultrasonic tone, inaudible to humans, that startles the animal into silence. The dog quickly associates its bark with the unpleasant sound, which conditions him to curb his undesirable behavior. An on/off switch with three levels of sensitivity 15' 30', 50' lets you control the units effective range, and a test mode enables you to verify the device is functioning properly. Its weatherproof ABC cabinet can be hung from a tree limb, mounted to a fence post, or hung on a wall for best results, install less than 5' off the ground . Requires one 9-volt battery that provides power for about two months, and an LED indicates battery life. For outdoor use only. 6 1/2 H x 5 3/4 W x 5 1/4 D. 1 1/4 lbs.