PQ9907S professional chess digital clock, available for Chinese chess, international chess and I-GO It is a preset countdown / countdown timer, up to 10 hours . With the alarm when the game is over, you can open or close the alarm, you can set up two different base times on both sides, it will store the last setting when power on . Made of electronic components and ABS shell, eco-friendly and durable, powered by 1 x AA battery (not included). How to use: When the countdown right has been set, short press start/pause/setting to enter bonus mode. When the right bonus time has been set, short press start/pause/setting to enter time setting display. Features: Using the latest chess clock design. Only five buttons, simple operation, easy to use. The monitor adopts LED large screen design with clear digital and exactatetiming. Designed for checkerboard lovers, it can be used in amateur and professional competitions. Can be used for chess, Chinese chess, Go, checkers and other double games. Product parameters: material: plastic (ABS) Display: LED digital display Maximum accumulated time: 10 hours (preset countdown possible) With end of alarm function Product size: 140*93*49mm Battery: 1 AA battery (without battery) Products include: 1 * Timer