No sound.
Also, it could have had two types/modes of work flow.
Focus and Varia.
Length of both to be set separately.
Focus - for the project work.
Varia - for ongoing errands (mails, replies and so on).

don't miss this for focus

Great tool. Simple and does exactly what I need it to.

this will be good if this can lock the internet access too.

One of my personal goals for 2021 is to use Pomodoro time managemenct more. I find this Tomato Clock extension is a great way to focus my attention and (perhaps more importantly) break my attention when I might be browsing social media too long instead of my work. :)