3-in-1 Multipurpose Portable Professional Chess Clock Digital Chess Timer Game Timer This digital clock is perfect for chess and other games that require countdown, count , bonus, and delay times. It's lightweight and small in size, so it fits in most bags conveniently and is portable to take to and from club or tournament events. 3-in-1 Multipurpose Portable Professional Chess Clock Digital Chess Timer Game Timer: Large flexible button with better sense of press.High quality of ABS durable material shell.Available for bonus &delay mode.Portable energy saving design. Functions: Basic: Set basic time. Delay：Set basic time, second reading times and time. Bonus：Set basic time and bonus time. Positive Timing: Set basic time to be 0 for overall rationing system Specifications: Battery: 2 * AAA battery (Not included) Material: ABS Color: Black / Yellow(Optional) Item size: 140 * 88 * 45mm / 5.51 * 3.46 * 1.77in Item weight: 105g / 3.70ounce Package size: 150 * 100 * 50mm / 5.91 * 3.94 * 1.97in Package weight: 157g / 5.54ounce Screen size: 103 * 23mm / 4.06 * 0.91in Packing List: 1 * Chess Clock Available for bonus &?delay mode. High quality of ABS plastic durable material shell. Portable energy saving design. Large flexible button with better sense of press.