Every mat and pairing official should have a good idea on the workings of the Clock Controller used by Track Wrestling at USAW events. Click Here to go to the TrackWrestling page with clock information. In the menu on the far left click on "Controller Download" to download the software to your computer where you can practice working with the clock controller. UnZip the file and make sure you have an updated version of Java running on your computer. There is a Java link in the folder downloaded from TW.
Click Here for a YouTube video link with clock controller instructions.