This is an instructable on how to make a small, portable morse code practice keyer that you can put in your pocket, take anywhere and practice learning Morse Code. It is composed of only two components and takes about half an hour or less to make.
I have taken a keychain tone generator, used for tuning musical stringed instruments, and simply added a contact switch between the tone generator circuit and it's speaker. Very cheap, portable and useful for learning Morse Code.
Watch the video to see how it works.