"Well, I’ve used a Protean Charm, among other things, on a few galleons. Theo will also have one and you just have to say the name of the person, or persons, you want to send the message to in your head and it will warm up in your hands. Here, hold yours and think of my name." She handed the galleon over to Daphne who was ogling the object with great interest. "And just like the name, you say the message nonverbally and it will light up on the other person’s coin."