Using this key shell is a breeze. Just snap it over your Subaru key. It's designed to fit snugly, so you don't have to worry about it falling off. When it comes to maintenance, a gentle wipe with a soft cloth is all you need to keep it looking shiny. Be aware that although it looks great, it may cause a small reduction in the key's signal range. So if you notice any issues with the key's functionality, keep this in mind.