Gentleman,
The 20 second lacrosse timer is used by all the officials on the field. In high school and college games, it is very important that all the game officials have it. The box official is only used in college playoff games, no other time. This official is never responsible for the delay of game call. Each official on the field needs the timer because the bench side official is responsible for activiating the timer and calling the delay of game penalty when needed. And since the officials rotate through the three different positions through out the game, at one time or another, each official will have the delay call. You can also visit the officials corner website and order the timer on line:
http://www.theofficialscorner.com