【SAFE AND EFFICIENT】This bark breaker is 100% Safe to your dogs, other pets, plants, and of course, yourself and your family. Stop excessive, noisy dog barking by emitting an ultrasonic sound to silence the dog. 【FOR ALL SIZES OF DOGS】The mini bark control deterrents uses high-frequency sound that works to reduce excessive bark of dogs within hearing range; For dogs 6 months and older UP TO 50 FOOT RANGE. Without need of traditional collar is safe for the most varieties of dogs. 【MINI DESIGN】This ultrasonic anti barking controller comes with a well-designed mini shape, can be hung on a tree, indoor, outdoor wall or fence post to stop any dogs barking(within range) 【ENERGY SAVING】Operates 9-Volt batteries ,average battery life 5-6 months depending on use. 【DURABLE AND WEATHERPROOF】DURABLE AND WEATHERPROOF - Deter your own dog or your neighbor's dog from barking.