An automatic timer with very loud siren used to fully automate sparring bouts and competitions.
Simply select number of rounds (1 to 12), round period (0.5 to 3 minutes) and rest period (15 to 90 seconds) and it automatically times the bout for you.
There are useful lights to indicate the progress through each round and rest periods.
It has a 'Halt clock' facility for stoppages.
Battery powered for portability.