http://www.training-timers.co.uk/pocket5prog.html
Great little timer. I actually got mine on EBay.
You can have
3 mins round 1 min rest,
2 mins round 1 min rest,
2 mins round 30 secs rest,
1:30 round 30 secs rest
30 second rounds with the last 10 seconds bleeped (good for tabatta or circuit stuff)
Nice and loud too. Had no problems with it