I am referring to giving a 3 digit code that has no meaning in itself such as pitch type/pitch location. The catcher looks on her wrist band for what the 3 digit code means. The catcher has to get the code, look up its meaning, then relay the pitch to the pitcher. It is uncrackable but does delay the game some...
Not if the catcher and pitcher both have the wristbands. Now it is one clear three digit sign from the dugout, one look at the band from both and pitch. Because you no longer have to hide the signs from anyone, you can go direct to the players instead of hiding signs from the dugout to the catcher and from the catcher to the pitcher.