This is a fun key fob and yes, you are required to have one. Ha. I have a ‘24 TRD Pro 4Runner in Terra (no one shows any love for Terra but that’s another topic). I kept it very basic, red topo case and black screws and it looks great. Everyone takes a second look at it when I pull keys out. As others have mentioned, the key is hard to get it to snap or seated just right but don’t worry, it will. On initial case swap, make sure you really push that key in to get it to click or the fob will fall off. Don’t worry cause you don’t ever need to use the key, hopefully. I’ve owned the fob for 6 months now and it looks as it did on day 1. The key clicks in very smoothly. I’m leaving a review cause I’m getting another for my spare key in a different color cause I love this fun fob.