Ultrasonic Anti-Barking Device Outdoor Dog Stop Bark Control Sonic Silencer Description Ultrasonic anti-barking device is within range of a barking dog, an internal microphone picks up the sound and the unit is automatically activated. The Bark Control emits an ultrasonic sound. The ultrasonic sound can be heard by dogs but is silent to humans. Outdoor sonic bark silencer can be hung on a tree, indoor, outdoor wall or fence post to stop dogs barking. Make sure the ultrasonic bark house be placed facing the dog and within range of the dog up to 50 feet away. Designed for easy hanging or mounting on a tree,wall or fence post to keep your own dog or your neighbors dog from barking Switch with 4 levels of operation including a test mode. Test-used to verify the microphone and speaker are functional. Features Uses ultrasonic technology to stop barks - More effective and durable. No more barking. Sensitive microphone for outdoor(waterproof) use. Can also be used indoors, recommended level for indoor use is level 1 Four adjustable ultrasonic volume levels - test, low, medium, and high, with LED battery power level indicator. The product will not work on deaf or hearing impaired dogs. There are some situations where dogs become desensitized. To avoid this, only turn the outdoor bark control on during periods of unwanted barking. The device uses low-intensity ultrasonic, is silent to humans and not harmful. Safe for small, medium, large dogs How The Outdoor Bark Control Works When the outdoor bark control is within range of a barking dog,an internal microphone pick up the sound and the unit is automatically activated.The outdoor bark control emits an ultrasonic sound.the ultrasonic sound can be heard by dogs but is silent to humans.Startled by the high-pitched sound that is safe and effective,the dog should stop barking,it will associate its bark with this unpleasant noise.When the dog stops barking the ultrasonic sound also stops.The outdoor bark control has 3 range levels and a test mode.It is effective up to 50 feet. Possible use for the Outdoor bark control Stop your barking dog Stop your neighbors' barking dog Train puppies not to bark Deter barking dogs on camping trips Package Includes 1 x New Outdoor Bark Control  1 x Manual