The Plantronics Savi has 3 settings to adjust range, but the further you set the range, the lower the talk time will be.
To adjust the range:
1) Place the headset into the base
2) Press the subscription button for 3 seconds
3) Both the desk phone and PC talk buttons on the top of the base will flash...
Green flashing lights = high range (up to 350 ft.)
Yellow flashing lights = medium range (approx. 230 ft.)
Red flashing lights = low range (approx. 115 ft.) offers the longest possible talk time of up to 9 hours
You have to keep holding the button for 3 seconds for each change of range. The user manual states it like this:
With the master headset docked and the system idle, press the subscription button for three seconds. Both the desk phone and the PC talk buttons will flash green for high range. If you press the subscription button again for three seconds, the talk buttons will flash yellow for medium range. If you press the subscription button again for three seconds, the talk buttons will flash red for low range.
The Savi will provide up to 9 hours of talk time. The talk time will be reduced when operating in wideband mode and/or if the headset is used consistently at a far distance from the base.