https://www.youtube.com/watch?v=nyzioprjgJM&pp=ygUbZG9nIHRyYWluaW5nIGNvbGxhciByZXZpZXdz My favorite e-collar in the world and the very very best e-collar i've ever tried is the martin systems chameleon, 3b and micro b collar. Let me tell you why. First of all, the extender moves the prongs out to the side of your dog's neck. So there's no risk of arcing because you're getting a much better connection with any standard e-collar. When you only have two connections trying to connect to one point in the dog's neck, you have issues where it may not be connecting and you have to cinch the collar. Very very tight, which is uncomfortable for your dog. The martin chameleon has solved that problem really quickly and really really simply another great feature contact measurement. That means, when i turn this collar on you're, going to see a series of lights flashing. What those lights are telling me right now is: i have no contact on the dog's skin or on any s...