Features: 1. Safety For Humans and Animals: Anti barking devices will not cause interference or harm to humans, because humans cannot hear these frequency bands, but dogs will be sensitive to these ultrasounds. 2. Use For A Long Period: The ultrasound of the dog deterrent device will not cause interference or harm to humans, but dogs will be sensitive to these ultrasounds. However, some dogs may be afraid or dislike this sound and will not stop barking at first, so please allow up to 2 weeks for training. 3. Dog Barking Deterrent: After testing, The anti barking device works best when placed within 50 feet. Covering the area indoors and outdoors. The smaller the range, the better the effect. Automatically activate a dog barking control devices to emit ultrasonic waves to stop dog barking. 4. Unique Birdhouse Design: The designer chose premium plastic from a variety of materials, which is waterproof and durable. It can withstand any weather conditions; making it an excellent outdoor bark control for dogs. Powered by 9 volt batteries (not included) and will last up to 1 month depending on use. 5. Fit For Most Dogs: Our ultrasonic dog anti-barking device is suitable for dogs of all sizes. The dog bark control device adopted ultrasonic technology to grab dogs attention. It works automatically without having your dog wear it or pressing any buttons. The sonics bark deterrent is ineffective for dogs with hearing problems, and we dont recommend using this ultrasonic bark control device on dogs under 6 months as it may disrupt the dogs development of hearing. Specification: Material: Plastic Product Color: Black, Red Package Size: 16.8 x 13.5 x 13.5cm Package Weight: 450g Battery: 9 Volt Battery (Not Included) Package Included: 1 x Anti Barking Device