At first I thought do I really need this what a distraction while driving. Boy was I wrong this is a MUST HAVE. If you have a NB or infant this is ideal to ensure all that fussing isn't due to being over bundled in the hot car seat or maybe they are sick and spit up all over themselves; or that hat you put on them slid down over their eyes and they are now very uncomfortable. And with a rear facing toddler seat it's good to take a quick glance at a red light to see if their quite because their asleep or getting into mischief back there. Also if you give snacks in the car you want to make sure they are alright if they start coughing. Adjustable, easy to install, and the kids love it too.