A really bright torch that fits and forms nicely with your key fob… This thing gets really good reviews amongst the EDC community.
I’m a carabiner on my keychain kind of guy – always have been. When I get out of my truck, I clip the keys on my belt loop and I always know where they are. It just works for me.
Given that, I’ve gone through all sorts of carabiners for key usage. I’ve been using a Handgrey for about three years now and while expensive as hell, they are the best I’ve ever found.