Plantronics Voyager 510 Bluetooth Headset - Manual (Page 15)

OUT OF RANGE WARNING
As you walk away from the base unit you will eventually reach the system operating
range limit. The system will issue audible warnings at the operating limit.
If not in a call:
One low tone when edge of range reached.
One high tone when back in range.
If in a call:
One low tone when edge of range reached.
One high tone followed by a triple tone when back in range
On hearing the edge of range alert you should walk closer to the base unit to ensure
call quality is maintained. If you stray out of range any active call will be suspended.
The call will be re-established on walking back in range
If you remain out of range for more than 10 minutes the system will drop the call
permanently. If using a Plantronics Handset Lifter the handset will be replaced and
the call terminated.
LOW BATTERY WARNING
When the headset battery is running low, an audible warning will be heard through
the headset as a single beep repeating every 20 seconds. The headset Status Indicator
will also flash red when the battery needs to be recharged. You should recharge the
headset immediately.
MUTE ACTIVE WARNING
When muted, the headset will sound two tones every 30 seconds.
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AUDIBLE WARNINGS