One, pointing to zero 1) Press the left and right buttons alternately, adjust the hands of the two timing clocks to the 12 o'clock position in turn, press the left and right buttons halfway at the same time , and the clocks on both sides are in the stop synchronization state. 2) Using the button on the back of the clock, adjust the minute and hour hands of the two timing clocks to the position 12 o'clock respectively3) During the competition, when the whole point judgment mark (small red flag) falls, the position where the minute hand is aligned is the zero position of the minute hand2. Timing operation 1) Press the left button, the left clock stops timing and the right clock starts timing; press the right button, the right clock stops timing, and the left clock starts timing 2) Press the left and right buttons halfway at the same time, and the clocks on both sides will stop timing. At this time, you can insert caps under the buttons respectively to ensure the pause state3) Take out the cap under the left and right buttons, press one of the two buttons according to the rules of the game, and continue timing3. Matters needing attention1) This product uses a No. 5 dry battery (not included)2) If not used for a long time, please remove the battery3) Avoid contact with corrosive objects, avoid exposure to sunshine, rain, drops and avoid getting close to magnetic fields or magnetic substances"Note: The data is all measured manually, please allow 1-3cm error, due to the difference in light and display, there will be a certain color difference, the actual object received shall prevail.