This digital clock is perfect for chess and other games requiring countdown, count-up, bonus, and delay times. It's lightweight and small, fitting comfortably in most bags and portable for club or tournament events. Features: Large, flexible button with improved tactile feedback. High-quality, durable ABS plastic shell. Available for bonus and delay modes. Portable, energy-saving design. Functions: Basic: Set basic time. Bonus: Set basic time and bonus time. Delay: Set basic time, second reading times, and time. Positive Timing: Set basic time to 0 for overall rationing system Specifications: Material: ABS Color: Black / Yellow (Optional) Battery: 2 * AAA Battery (Not Included) Screen Size: 103 * 23 mm / 4.06 * 0.91 in Item Size: 140 * 88 * 45 mm / 5.51 * 3.46 * 1.77 in Item Weight: 105 g / 3.70 ounce Package Size: 150 * 100 * 50 mm / 5.91 * 3.94 * 1.97 in Package Weight: 157 g / 5.54 ounce Packing List: 1 * Chess Clock