Need to know how long you take to reply to EMails, be reminded to when change the CO2 filter or run a program every 3 hours? Secs is an easy to use timer, capable of counting up as well as down, and settable by second divisions from 1 second up to almost 50 days. It can have a beep or almost any standard audio file (including MP3s) for the "time-up" sound, either of which can be set to repeat, plus it can also run files.