We want to ensure yourpets safety by providing you with the tools and techniques to successfuly train your pet. How the Outdoor Bark Control Works When the Outdoor Bark Control is within range of a barking dog, an internal microphone picks up the sound and the device 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, as 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 to50 feet. Features: 1.Uses ultrasonic sound to deter unwanted barking 2.Detects barks up to 50 feet with the use of an internal microphone 3.Levels of operation including a test mode 4.Chargeable,Durable and weatherproof for outdoor use Possible Uses for the Outdoor Bark Control-Stop your barking dog 5.Stop your neighbors barking dog 6.Train puppies not to bark 7.Deter barking dogs on camping trips Caution: 1.Humans cannot hear the ultrasonicsound, however precautions should be taken when preparing the Outdoor Bark Control for use. 2.Keep an arms length away from the human ear to avoid hearing damage if a dog begins barking while you are setting up, mounting or hanging the Outdoor Bark Control. 3.Humans should also avoid standing very close to the Outdoor Bark Control when it is on. 4.Not for use by children. NOTE: This device is intended for use only with dogs. Never attempt to use it for any purpose not described in this manual.Keep away from children.