The DGT North American Clock is the clock to get when it comes to a tournament standard clock. It is amazing for both classical and blitz chess games. This chess clock offers a variety different time options including time, time + guillotine, 2 X + guillotine, time + repeating time, bonus ("Fischer") options, time + bonus, 2 X time + bonus, bonus single period, bonus tournament. 
Features:
Set delay controls for two or even three time periods
Quick and easy to set and program
Choose quick-set options for the 13 most popular controls
Set any control manually, fast
Turn move counter on and off in any option
Super-easy to correct both time and move count
Sound-alert option warns of time trouble
Signals a low battery
16 contrast settings adjust for any lighting
2-year warranty against manufacturing defects
Two AA batteries included
Manual
Specifications:
Clock dimensions: 7 3/4'' long X 2 1/4'' high X 4 1/4'' deep.