Great column. When the battery is low, the red button starts flashing, but before it is completely discharged, it can work for a couple more hours. So it is quite enough for a whole day of continuous sound (50-60% of sound). We've been using it for a couple of months and are very happy with it. A telephone conversation does not output to the speaker, only audio / video playback. It is recommended to charge 1.5-2 hours.
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