How Is Iron Man’s Backplate Backbling Reactive

When you reach level 89 in the Chapter 2 Season 4 battlepass you recieve the Iron Man Backplate backbling, this backbling is actually reactive. When you get a elimination the number shows up on the back of the backbling in a small blue section, so for example if you have 5 kills it will show the number 5 on the back. Another way that this backbling is reactive is that when you ADS two lasers light pop up from the sides. I really like this backbling because of its look and reactivity so all in all I rate this backbling a 4/5