All of mine are microchipped and they also wear the break away collars. I have collars and ID tags for Alani & Blaze but I just haven't gotten around to putting them on them. When they were smaller, I was told to wait until they grew a bit because the rescue lady said that sometimes kittens have hung themselves because the collars didn't break open because they didn't weigh enough. My RB Sunny wore a collar briefly but he became so stressed out about it that he made himself sick so I had to take it off of him. Good luck.