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    Q: CM120 is connected correctly, but LED indicator does not light up, why?

    A: Replace the battery and make sure the battery is in good contact. If the LED indicator still does not light up, the charger is faulty.

    Q: CM120 is connected correctly, but the red and green LED flash alternately, why?

    A: Please change the power supply or battery. For example, if you use a computer USB interface or a power bank to supply power, try a mobile phone charging head.  Make sure the battery is in good contact. If the red and green LED still flash alternately, the charger is faulty.

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