【PARTICULAR ATTENTION】:The adaptability of different dogs to ultrasound is different.It may take 2-3 weeks for some dogs to take effect. 【NEW TECH】: Stop excessive, noisy dog barking by emitting an ultrasonic sound to silence the dog. More effective than old version deterrents and waterproof. 【HIGHLY FUNCTION】: Contain sensitive microphone isolates and picks up barking up to 50 feet away to stop barking both outdoors and indoors. 【ENDEARING DESIGN】: For visual appeal, the anti-barking design features a well-designed birdhouse shape. In can easily be mounted on a tree, wall or fence post outdoors to stop dogs barking within a 50-foot range. 【HUMAN & PETS SAFE】: 100% SAFE. Safe to your dogs of any size, other pets, plants, and of course yourself and your loved ones.