DOGTEK’s Sonic Birdhouse has the appearance of an ordinary birdhouse but in fact, it’s a state of the art bark control device the uses high-pitched ultrasonic sound technology to deter unwanted barking from either your or your or your neighbor’s dogs! How does it work? When the DOGTEK Sonic Birdhouse is within range of a barking dog, the internal microphones sense the barking and the unit is triggered automatically. The DOGTEK Sonic Birdhouse emits an ultrasonic sound which is heard by dogs but is not detected by humans. The dog will stop barking when The DOGTEK Sonic Birdhouse emits it high-pitched, safe and effective tone. The dog will begin to associate their bark with this unpleasant noise. When the dog stops barking the ultrasonic tone will also stop. The DOGTEK Sonic Birdhouse has 3 sensitivity levels and a test mode to choose from. It is effective up to 50 feet. Possible Uses for the DOGTEK Sonic Birdhouse: Stop your barking dog. Stop your neighbor’s barking dog. Train puppies not to bark. Deter barking dogs on camping trips and when you are on the go. Operates using 6 AA batteries (not included). **Please note: This product might not work on 10% of dogs, specifically dogs whose ears may be covered or down facing. The sound may not reach their ears enough to function properly. These dogs may benefit more from a bark collar**