The key is very small. The lack of cap saves in size. I do not think that dust is a problem but the hood of my other key enabled me to remember the key on my PC at work. A priori, there is a hole for attaching the key to a key ring. But I would lose the advantage of its size. It's almost the cheapest in the market key. You do not pay miniaturization. Do not expect it to be fast. For me the only flaw is the absence of light.
