The bright red light of the Bluetooth headset indicates that the power of the charging box is too low, and it needs to be charged in time. If you are using a wired charging box, you can find the charging interface at the bottom of the charging box and connect the charging cable to start charging.
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In the case of Airpods, wired charging is faster than wireless charging. Wired charging for half an hour can be charged with 23% electricity, wireless charging for half an hour can be charged with 16% electricity; Wired charging takes 2 hours and 34 minutes to fully charge, and wireless charging takes 3 hours and 46 minutes to fully charge.
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The Airpods pro offers up to five hours of listening time or two hours of talk time on a full charge. If the charging case is fully charged, you can get more than 24 hours of listening time or up to 11 hours of talk time after multiple charges