Timer set for 30 seconds with buzzer. Simply press start. Alarm is optional. 30 sec are one half-minute.
How to use 30 seconds timer
The timer tells you when your time has expired. The clock continues to run when your half minute has passed.
Sound notification is optional. You can keep the timer running in the background if you for example open a new tab. If you have sound notification the timer will tell you when time is up.
30 seconds is 0.5 minute or one half-minute.