This collar is 100% awful. I actually paid $99 for it at one of the big pet stores, so at least Amazon has a much lower price. That being said, this thing isn't worth a penny. Apparently it worked for some of the dogs mentioned in these reviews, but all it did to my dog was go off in his face at random times (not when he barked), which did nothing but terrify and confuse him. It's a bulky collar, but I have a big dog so that wasn't a problem. I can't imagine using this on a small dog though. Also, the citronella smell is awful and makes the whole room stink for hours. Do yourself and your dog a favor and avoid this collar.