We use coach's wristbands for defense and offense. Its all one number hand signals and only a few verbals for defenseive situations. Very few missed signs, definitely faster if you and your team practice with them prior to going live! Many returning players have many call sequences memorized for each color card, which speeds up the process. Some go way overboard with colors or code names to go along with a number and hollar every pitch. We usually have 2 calls in mind already depending on the count and situation per pitch. Like someone said earlier, calls only get signed about 1/3 of the batter's at bat.