1.The quartz watch has a weakness display function, when the battery will run out, the second hand will beat once every 4 seconds. If this happens, then the battery should be replaced immediately.
2.The motor of two hands quartz watch movement restart every 20 seconds, so it is better to make it 1-2 minutes faster when adjust the time.
3.For three hands quartz watch, because there is a gear gap in the design process, the second may can not calculate accurate time or hands may shaking after be hited under force. these are not quality problems.
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