The Advanced Digital Game Timer with Bonus & Delay is a reliable game timer that is easy to program and use. It measures 6.5"x2.5"x4", plus it has a color contrast rocker arm that is easy to see from a distance so you can know whose turn it is. It also features an audible alarm that can easily be turned on or off for a game. This clock supports bonus/increment (Fisher), standard delay and Byo Yomi modes. The time, bonus/increment and delay times can be set different for each side of the timer if desired. Also, you can easily review the number of moves already played-simply push and hold the +button during a game for three seconds and the moves will be displayed. The clock has 38 pre-programmed timing modes for most popular chess game setups. However, if you would like a custom timing mode, you can modify any of the 38 pre-programmed modes and save it to one user-defined location. You can also create a custom timing mode from scratch. This clock supports multiple time controls (up to four per game). It runs well on 2AA batteries (included).