Just do it
Owned 3 cheaper eBay bark collars before purchasing this one. My dog is a Staffy x Rottweiler who barked incessantly from 4:30am (when I left the house) to around 10am, understandable the neighbours were not impressed. After the first use there was a noticeable difference and by day 3 the barking had stopped completely, can now get along with the neighbours without having to apologise about the dog! Just spend the money and get the quality product, simple