Features: The portable professional chess clock has the countdown function, the timing function, the second function, the display of the number of chess step, the time-limit function, the mute-function, and the second reading function. Different basic-time and auxiliary-parameters can be set on the left and right sides; During the competition, the basic-time and auxiliary-parameters of both sides can be-modified; The rule and parameters before shut-down can be maintained by restarting after shut-down. The portable timer has total of 6-categories and 59 timing rule, each of which can set basic-time and auxiliary-parameters. It can support hundreds of two-player-games in the world and create more fun . The portable timer is easy to set and control, and can quickly start the-games. Even beginners can operate easily. It uses two AA-batteries for power supply and can be used for long-time. Chess clock timer has large screen high-definition display, accurate timing, and is easy to read. Light weight, easy to carry. It is very suitable for chess, Chinese chess, Go and other chess-games. Specifications: Material: ABS-Material Color: black/orange/green/yellow/blue Size: Approx. 18.2x10x6.3cm/7.16x3.94x2.48inch Battery: 2x AA-battery (not included) Note: Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1x Digital Chess Clock