Amazon Basics BSK30 Mode D'emploi page 6

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Setup Instructions
Charging
Plug the micro USB end of charging cable into the micro USB port in speaker.
Then plug the standard USB end into an available USB port on your computer
or a USB charger adapter in a wall outlet. The LED indicator will flash red to
confirm the speaker has begun charging. When fully charged, the LED indicator
will turn off.
Charging time: 3.5 hours
Discharging/Playback time: 12 hours (70% volume)
Note: When the speaker battery is low, the speaker will sound a warning
tone and red LED indicator will flash slowly.
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