A chess clock works by using two clocks, both set into the same frame. The clock will be placed beside the chess board so that both players can easily reach it. When one button is pressed, the player's time who pressed it will stop, and his opponent's clock will begin to count down. If a player runs out of time he loses.
Analog versus DigitalEdit
There are two basic types of chess clocks. The first is the analog clock and the second is the digital. While analogs are still used, they have fallen out of favor and have essentially been replaced by the more modern digital clocks.
Clock Apps Edit
Apps and onlineclocks such as ChessBullet.com or Online-Stopwatch.com has become more and more popular in small amateur tournaments since they are cheaper than ordinary clocks and have the benefit, where you can project the clock on to a larger TV for the audience to see.