As an owner of 2 dogs this was a fun product for me to try *click to read my review disclaimer. When the box came I wont lie, I was a little sketchy because it was very lightweight. With that said it fits both dogs and I have a Pit-bull and Husky so it accommodates larger breeds and because it's so light weight they don't try to remove it.
I am not a fan of a shock collar so I like this product is sound and vibration only. It comes with 2 color plates so if blue isn't your color there's orange. (battery is under the plate)
(Little history...Buddy isn't a fan of door knockers and feels the need to bark and jump on the window. Nova the blue nose barks because her friend is barking)
Update- Buddy no longer barks and jumps on the window. Barks one time and lays down or sits.
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To see for yourself check them out on Amazon