【實用運動app】Roller Derby Timer|最夯免費app-綠色工廠好玩App

Custom timers designed specifically for flat and banked track roller derby bouts. The period timer allows you to time jam, jam transition, timeout, and period times; handoff between clocks is automatic. The penalty timer, which is free and fully functional in the preview version, enables you to time penalties for 4 blockers and 2 jammers simultaneously. The jammer rule (WFTDA 7.4) is automatically enforced by default. The clocks and team information are customizable, and the app vibrates to warn you when a clock is low and when it expires.