Timer for 20 seconds. Online timer set for twenty seconds. Press start to activate this simple, online countdown. Alarm is optional.
How to use 20 seconds timer
The timer will tell you when your 20 seconds has run out. It will keep counting upward when your time has run out.
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.