GROWUPER Pet Heating Pad, Electric Heating Pad Indoor Waterproof Adjustable Warming for Dog,Cat,Bird Rabbit Small Animal 19.7x19.7In UPGRADED TECH: Stop excessive, noisy dog barking by emitting an ultrasonic sound to silence the dog. More effective than old version deterrents and waterproof. 100% SAFE : Trusted by dog trainer & veterinarians. No electric shock, no liquid propellant is used, and most humane and used widely way to keep your own dog or your neighbors dog from barking. MINI SIZE:Designed for easy hanging or mounting on a tree,wall or fence post. Using this technique you can make your dog no longer bark and make you have a quiet environment. Uses high-frequency sound that works to reduce excessive bark of dogs within hearing range; For dogs 6 months and older UP TO 25 FOOT RANGE. OPERATES :9-Volt batteries (not included) and will last up to 6 months depending on use. GUARANTEE: DOPA offers a 100% Satisfaction experience! Any reason our product doesn't meet your standards, just send it back our way for a replacement or a full refund!