So I have a plan to make a keychain that uses a small RC transmitter to activate a servo that will lock/unlock a deadbolt on a door. I have the servo mechanism designed but I can't seem to find an RC transmitter that's small and simple enough for what I need. I litterally need a tiny transmitter that has one or two inputs, and a compatible reciever. Any suggestions on what to use? Perhaps a toy to dismantle?

I'm using this servo for what it's worth.

Thanks!