Features: The portable professional chess clock has the functions of contract system, add seconds system, second reading system, time-limit for each step, second reading for each step, positive timing, step recording, voice second reading and memory. You can set several groups of your own commonly used-time. After saving, you can use it repeatedly without secondary setting. The power-on memory is still available after power-off, which is convenient to use. The portable timer is easy to set and control, and can quickly start the-game. 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 easy to read. Light weight, easy to carry. It is very suitable for chess, Chinese chess, Go and other chess game. Specifications: Material: ABS-Material Size: Approx. 17.5x8.5x5cm/7x3.35x1.97inch 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