The NVK Dog Training Collar with 2 receivers is an excellent product. Used it now for 2 evenings while my dog is around another, only having to use the vibration and beep modes thus far and she has responded well to those. It definitely has curbed the psycho mode, hoping I don't have to use the shock mode, which I tried on myself on 10 and it reminded me of being zapped by spark plug and wire on a push mower. Highly recommended!