3 Lithium Metal batteries required. (included)

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[60 Hour Playtime] You can get up to 8 hours of continuous playtime per charge of the earbuds, and up to 60 hours with the small portable charging case.
[Premium Sound Quality] Powered by Realtek headphone chip and high definition speaker, T3 wireless earbuds provides 1.5 times wider frequency than normal earbuds provide. You will hear more details, more texture of bass, and better clarity of treble.