This is a kind of professional chess competition timer, 3-mode design, multi-use, can be satisfied with multiple GO rules. Support step counting function, support countdown / countdown. Easy operation, quick selection and rule setting. Suitable for Chinese Chess, International Chess and GO. You can have a try. Features: Multi-use design with 3 working modes, which can be satisfied with multiple rules of GO. Plug support step counting function, support countdown / countdown. Easy operation, quick selection and setting of the rule and one button to start. With the function of memory, it can be used repeatedly after setting once. Equipped with sound alarm, you can open or close it according to your demands. Suitable for chess Chinese, International and GO Chess. Features: Name: Chess Competition Timer Model: YS-902 Material: ABS Color: Black, Yellow (optional) Battery: 2 * AAA batteries (not included) Size Screen size: 103 * 23 mm / 4.06 * 0.91 inch Item size: 140 * 88 * 45 mm / 5.51 * 3.46 * 1.77 inch Item weight: 105g / 3.70 ounces Package size: 150 * 100 * 50mm / 5.91 * 3.94 * 1.97 inches Package weight: 157g / 5.54 ounces Packing list: 1 * Chess ClockProducts from Botao's store