Feature:1. Large flexible button with better sense of press.2. High quality of ABS plastic material shell.3. Available for bonus \u0026?delay mode.Specification:This digital clock is perfect for chess and other games that require countdown, count up, 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.Features:Large flexible button with better sense of press.High quality of ABS plastic material shell.Available for bonus & delay 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 * AAA battery Screen size: 103 * 23mm / 4.06 * 0.91inItem size: 140 * 88 * 45mm / 5.51 * 3.46 * 1.77inItem weight: 105g / 3.70ouncePackage size: 150 * 100 * 50mm / 5.91 * 3.94 * 1.97inPackage weight: 157g / 5.54ouncePacking List:1 * Chess ClockPackage List:1 * Chess Clock