How does the application know the charge of the headphones?

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pthon2019-10-08 19:51:19

Android

pthon, 2019-10-08 19:51:19

I bought bluetooth headphones (marshall major 2 bluetooth), but no application from the market can display their charge. Therefore, I decided to write an application myself, for a charge check. Could you please explain to me how the charge checking apps get the charge information?

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