The timer operates from the electricity mains.
You can buy an extra battery for the timer,
which is enough for 20 hours of continuous operation, as well as a charger.
The timer is equipped with a loud speaker, so it will be heard even at competitions, and a large bright display is visible from a distance.
The timer functions:
selection of the working time (round) from 10s to 10 minutes, with a time interval of 10 sec (default 3 min)
selection of the time of a break from 10 seconds to 10 minutes, with a time interval of 5 seconds (default 1 minute)
selection of the number of rounds from 1 to unlimited (by default 3 rounds)
round selection (short beep)
from 10 seconds to 5 minutes (default 0)
Set includes: boxer timer, charger, instruction (in Russian), (battery not included).
Optional built-in battery - $ 50