To start a contdown, just click on the time or the timer target and and little input fields will show up. Within the fields for hours, minutes and seconds you can use the up and down arrow keys to raise or lower their values and of course you can use Tab/Shift-Tab to switch between the input fields. When you have entered everything, press the play button and get back to work till TeaTimer alarms you.
TeaTimer currently speaks English and German - further translations are welcome.
Updated on Nov 20 2011