50 yards allows you to use the collar for basic obedience training in your yard or at your home. (dogfencediy.com)
Also, after being involved with dogs for 45 - years, I have found most owners of intact male dogs do a minimum of basic obedience training with them. (psychologytoday.com)
Unfortunately most dog training obedience classes still use these old training systems. (leerburg.com)