Samsung HM6400 - Manual (Page 14)

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Using your headset
This section explains how to turn the headset on, pair and connect to the phone,
and use various functions.
Activated functions and features may differ depending on the phone type. •
Some devices, especially those that are not tested or approved by Bluetooth SIG, •
may be incompatible with your headset.
Handle the headset properly to improve performance
Do not block the device’s internal antenna. The human body can interfere with a •
Bluetooth signal.
If you usually use your mobile phone with your right hand, wear the headset on •
your right ear.
Avoid coming in contact with the internal antenna of a headset or mobile phone for •
better performance.