At medium volume, the battery lasts about 15 hours, but at maximum volume, 10-12 hours. In the ears they sit quite well, because. they are small enough that they do not strive to fall out of the ear (unlike my old Awei A920BL with neodymium magnets for connection). They sit well on the neck, and due to the presence of two batteries, you can listen to music using only one earphone)) while the headphones will not lead to the side of the battery.
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