I hesitated to buy more expensive, but for now this device works great for 2 small dogs. The advantage: not only can only "beep" dogs (classical) but also can be vibrations in the neck, quite painless but it has its effect and that's enough for my dogs. I have not yet had to use the system electrocution 'works well too. I found the presentation very neat plus: small kit, tidy elements in it. Only downside: no key to change the heads of the electrical system (long hair); there must be another way ... I do not regret my purchase because the price is reasonable compared to other brands; I expect to see over time.