Chess clock YS-902 The perfect chess clock for travel, home, school, or sports club. Simple, intuitive to use. It has a reset button, there is no need to turn the clock off and on again to be able to choose a different timing rule. Any time can be set. Support YS-902 chess clock on youtube channel: Functions: Measurement of time down Measure down time with a bonus for every move Measure down time with delay before each move Technical specification: Material: ABS Color: Black/Yellow (Black Available) Power Supply: 2 AA Batteries Screen Size: 103*23mm Item Size: 140*88*45mm Weight: 105g I also have other types of chess clocks. I recommend! This digital clock is perfect for chess and other games that require countdowns, counting, bonuses, and delays. It is lightweight and small, so it fits comfortably in most bags and is portable to take to and from club or tournament events. Large elastic button with better sense of pressure. High quality durable ABS plastic shell. Available for bonus delay mode. Portable energy-saving design. Functions: Basic: Set the basic time. Bonus: Set the basic time and bonus time. Latency: Set base time, second read time, and time. Positive time: Set the base time to 0 for the general rationing system