If it's all keyless (doors too), then you can take the chip out of the key and put it in something much smaller and put that on your keychain. I removed it from the fob and put it on the ignition. Yes technically my car can be hot wired now I think but it's a 13 year old car and it's only parked somewhere other than my garage or office overnight a couple times a year so I'm not worried about it. Here is the key: I'd like to retain the keyless entry with a smaller fob as I do miss it. I've thought about removing JUST the remote board and putting heat shrink over it or something and just carrying it loose in my pocket. Not very elegant but the circuit board is TINY compared to the fob.