This digital clock is perfect for chess and other games that require countdown, count up, bonus, and delay times. Itand39 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.Features:Large flexible button with better sense of press.High quality of ABS plastic durable material shell.Available for bonus anddelay mode.Portable energy saving design.Functions:Basic: Set basic time.BonusSet basic time and bonus time.DelaySet basic time, second reading times and time.Positive Timing: Set basic time to be 0 for overall rationing systemSpecifications:Material: ABSColor: Black / Yellow(Optional)Battery: 2 x AAA battery (Not included)Screen size: 103 x 23mm / 4.06 x 0.91inItem size: 140 x 88 x 45mm / 5.51 x 3.46 x 1.77inItem weight: 105g / 3.70ouncePackage size: 150 x 100 x 50mm / 5.91 x 3.94 x 1.97inPackage weight: 157g / 5.54ouncePacking List:1 x Chess Clock