Includes Morse Code transmitter, receiver, and linking wire; Jefferson wheel; and sempahore flags. This innovative book and kit for ages 6 to 12 features everything needed to decipher a variety of codes. Kids can send hidden messages to their friends while learning and having fun. Text explores the fascinating history of secret codes as used by Native Americans during World War II, as well as instructions on sending messages via Morse Code, semaphore flags, ciphers, and braille.