The Hallmark Text Band is a strange thing: Doesn’t Hallmark know kids have cell phones now? Anyway, it is an extremely simple micro-controller driving a led matrix and a C-Max CMM-9201. You get 10 characters, and a small reed-switch? triggers a hardware interrupt, and broadcasts your 10 characters to a friend, and you swap messages. The devices holds 24 messages, FIFO. Memory is volatile. Profanity filter included. Oh well.