If you want to keep it simple, checkout Target in the travel section and look for a Life Gear 2pk keychain light set. They're under $10 and smaller than the Nano. They're only 8 lumens but they're non-obstrusive and you won't notice them in your keychain. I didn't think 8 lms was much but it's great for finding your doorknob or checking your closet for something. I use one to supplement my EDC flashlight I carry in my pocket.