Brilliant!!

As a new NSO and learning all the tips and tricks to running the penalty box, this App is a godsend. It incorporates the full Jammer rules, and you can turn them on and off. Its an App every Derby player, NSO, and Ref should have. The vibrate feature is wonderful! I havent had a problem with it yet. Oh and it is great for practice jams too. With the manuel time set function, you can start a Jam with a Jammer or Blocker in the box for a simulated ammount of time of your chooseing. Put it this way. You could buy 6 stopwatches; or spend the $3 on this wonderfull app. Its a win win situation. Just cant wait for an iPad version ;)

Little Toona about PenaltyTimer