What is a "collar Dogtra? It is a shock collar or something else?

I had already been in these places, but still collar not understand what it is.

Yes, it's a shock collar that comes with a remote control that lets you set the level of stimulation and managing whenever you want. They come in a variety of different models for everything from use in the yard and around the house, the long-range hunting. Prices range from $ 100 to over $ 500. The latest models even incorporate GPS receiver so you know where dog is at all times.

How to use electronic/pager e-collar dog training Dogtra