How will I know when the battery is running low?
When the battery power is decreasing and approximately one hour of run time remains, an audio signal of 3 tones will be heard in the headset. The battery should be charged as soon as possible at that point. The headset will turn off automatically when the battery is fully drained. (Page 6)
From the official Hellberg Xstream Wireless Headset manual, page 6
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