Got his one for my 2 yeasrs old Rottweiler and Staffy mix boy who hasn't been neutred and despite beeing sweet, friendly and cuddly boy - shows a bit of dominance around other male dogs. He used to be bullied when younger and I think now he is not taking it anymore and prefers to show who is the boss. The worst part is that he starts to mark everything (even other dogs and humans) when new male dog is around.
So decided to get correctional collar and I am glad we did. Despite sounding quite cruel - it is not. It is only providing vibration and/ or sound effect and I have tested it on myself so there is no real harm.
This collar has 3 alarm settings (single vibration, continious vibration and sound), different vibration level settings (up to level 99) and a possibility to switch between up to 3 dogs. All in all - a very sturdy collar and receiver. The only slighly negative comment - I would prefer textile collar band instead of imitated leather.
P.S. Both units can be charged via mains.