Roller Derby Penalty Timer is the best mobile app created specifically for roller derby officials. Typical stopwatches can be unreliable and cumbersome to use. Roller Derby Penalty Timer provides a reliable way to track penalties with built-in knowledge of the WFTDA ruleset for those tricky jammer situations. If you’re short staffed at practice, managing the full penalty box is no problem!Features:Manage any configuration you’d like: two blockers, two jammers, four blockers, or even the full penalty box!Stop all timers simultaneously between jams.10 second warning, alerting you to tell the skater to stand up.Tap-edit allows you to quickly edit a time or add a minute for a double-penalty.Customizable colors to match the team uniforms.Paid Version contains NO Ads. Plus it helps support further development!Auto Airplane mode in Paid Version.