Humutan Anti Barking Device, 2019 New Bark Box Outdoor Dog Repellent Device with Adjustable Ultrasonic Level Control Safe for Small Medium Large Dogs, Sonic Bark Deterrents, Bark Control DeviceDurable and Weatherproof: Built with the highest level of quality to ensure long term use; it is waterproof and durable so it can withstand any weather conditions; making it an excellent outdoor bark control for dogs. Light Weight: This version is light weight and was designed super cute and adorable for outdoor decor; although it may be used indoors as well it isn't recommended. Adjustable Ultrasonic Level Control: Safe for small medium large dogs.