One, pointing to zero: 1) Press the left and right buttons alternately to adjust the hands of the two timing clocks to the 12 o'clock position. Press the left and right buttons halfway at the same time to bring both clocks to a synchronized stop state. 2) Use the button on the back of the clock to adjust the minute and hour hands of both timing clocks to the 12 o'clock position respectively. 3) During competition, when the point judgment marker (small red flag) falls, the position where the minute hand aligns is considered the zero position for the minute hand. Timing operation: 1) Press the left button to stop the left clock and start the right clock; press the right button to stop the right clock and start the left clock. 2) Press the left and right buttons halfway simultaneously to stop timing on both clocks. Caps can be inserted under the buttons to maintain the pause state. 3) Remove the caps from under the buttons and press one of the buttons according to game rules to resume timing. Matters needing attention: 1) This product uses a size AA dry battery (not included). 2) If not used for an extended period, remove the battery. 3) Avoid contact with corrosive materials, exposure to direct sunlight, water, drops, and keep away from magnetic fields or magnetic substances. Note: All data measured manually; please allow 1–3 cm variation. Due to differences in lighting and display, some color variation may occur. The actual item received shall prevail.