What does the Collar button under Settings do? May 12, 2020 16:47 Updated Under Collar, you can add a collar, edit a collar, and delete a collar. Related articles I have a growing dog, what size Halo Collar should I get? How do I attach the Halo Collar to the provided strap? How do I manage prevention feedback and encouragement feedback? How do I manage my collar's connection to my wireless or WiFi network? Why is my dog receiving corrections while inside my house?