`Space` / `Enter`	Start and pause the timer
`↑` `↓`	Adjust the countdown duration
`Shift` +`I`	Open the duration input dialog
`1` `2` `3` `4` `5` `6` `7` `8` `9` `0`	Enter a duration. This works even when the input fields for the duration aren't visible. Type 0 first to include seconds in the duration.
`Backspace`	Reset the timer

`Shift` +`K`	Open this overview with keyboard shortcuts
`Shift` +`P`	Open the preferences menu
`Shift` +`S`	Open the sharing menu