Here are some informative and instructive videos on digital chess clocks. If you have one of these or are thinking about buying one, take a look at these videos.
How to set a Chronos Chess Clock II:
Chronos GX – how to access blitz and tournament modes:
How to Program Delay on the Chronox GX Chess Clock:
How to Program move time Increment – Chronos GX digital chess clock:
How to Configure Fischer, Bronstein, and Normal Delays on Chronos Chess Clocks (I or II):
DGT XL Chess Clock:
Programming a DGT XL chessclock:
Programming a DGT XL chessclock:
DGT North American Chess Clock:
DGT Easy Game Timer – Chess Clock:
DGT 2010 time correction:
Saitek Chess Competition Game Clock Scholastic Blue:
Saitek Competition Pro Game Clock III:
Tallahassee Chess Blog 