This is a professional chess competition timer featuring a 3-mode design suitable for multiple GO rules. It supports step counting and countdown functions. Simple operation allows quick selection and rule setting with one-button start. Includes memory function for repeated use after initial setup. Equipped with a sound alarm that can be turned on or off as needed. Suitable for Chinese Chess, International Chess, and GO. Features: - Multi-use design with 3 working modes compatible with various GO rules - Supports step counting and countdown/count-up functions - Easy operation with quick rule selection and one-button start - Memory function enables repeated use after setup - Sound alarm can be enabled or disabled - Suitable for Chinese Chess, International Chess, and GO Name: Chess Competition Timer Model: YS-902 Material: ABS Color: Black, Yellow (optional) Battery: 2 * AAA batteries (not included) 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 Clock