FITS ALL SIZES OF - The bark deterrent is suitable for of all sizes. Bark use ultrasonic technology to get your dog's attention. It works automatically and your dog doesn't need to wear it or press any buttons. Effective distance up to 75 feet - Bark control device can automatically detect dog barking up to 75 feet . It then automatically emits ultrasonic waves that only can hear. Suitable for of All Sizes: The bark deterrent is suitable for of all sizes. Bark use ultrasonic technology to get your dog's attention. It works automatically and your dog doesn't need to wear it or press any buttons. It's very simple to use - the dog whistle stops barking. This small dog deterrent is easy to mount on a wall, hang on a tree, or place on a fence post near your home; plus, it's incredibly easy to set up and start using; making it the best electronic device for your pup. Pet training. Durable and Weatherproof - Built to the highest quality level to long-term use; it is waterproof and durable so you can hang it outdoors in any weather conditions and requires 1 9V battery (batteries not included), making it a dog-friendly Great outdoor barking controller. So why not give it a try now? Would you like the quiet and your dog like not being yelled at? Colour:Black Material:ABS Package Contents: 1 x barking device Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.