When you put it on charge, you must turn off the bluetooth carefully insert it, and see that the red light on each earphone lights up for a few seconds. After six months of use, they began to fail when charging. When you put it on charge, you must turn off the bluetooth. It has happened to me a great number of times while I was driving, and each time, after I had just put the headphones on charge, I discovered that they were not charged. This makes me very angry.
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