⚡【IMPROVED TECH】Stop excessive, noisy dog barking behavior by low intensity ultrasonic silencer which is safe to the dog, other pets, and human. More effective than old version deterrents. Improved with LED, water-resistant, and well-designed housing. ⚡【HIGHLY FUNCTION】Contain sensitive electronic microphone which picks up barking sound up to 50 feet away and automatically emit low intensity ultrasonic, safe and effective way to stop your dog or your neighbors dog (all sizes and breeds) from barking indoor/outdoor. ⚡【EXCELLENT DESIGN】New outdoor bark controller stopper come with a well designed birdhouse shape. Box designed for easy mounting on a tree, wall, fence, table-top, hand-held or just put it on the ground. ⚡【HUMAN & PET SAFE】100% SAFE to your dogs of any size and breeds, other pets, plants, and human. ⚡【SATISFACTION GUARANTEED】We'll buy them back from you, if the repeller does not satisfy your needs. No question asked.