Firstly Comfort Upgraded Anti Barking Device Dog - Outdoor - Waterproof Ultrasonic bark Controller - Stop bark Repeller - Small Deterrent Silencer no Collar - Wireless - Automatic - Humane - WhistleNEWEST TECHNOLOGY Stop excessive, noisy dog barking by emitting an ultrasonic sound to silence the dogs. This version is more effective than old version deterrents and does not shock the dog. COMPLIMENTARY ULTRASONIC WHISTLE INCLUDED to help you train, teach and control your dog no matter where you go. SUPER MINI DESIGN & WATERPROOF This MINI anti bark dog controller is rectangle shape which is much more convenient and easier hanging or mounting on a