Sony HBH-65 - Manual (Page 9)

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Using the headset 9
To adjust the ear hook for left-ear use: Using the headset
Once you have paired the headset with your phone,
you can make and receive calls using the headset as
long as it is turned on and within range of the phone –
up to 10 m (30 ft) outdoors or up to 5 m (15 ft) indoors
with no solid objects in between. For best
performance, use the headset and phone in the
same room.
Optimal
performance
Limited
performance
Up to 5 m