Philips SHB7110-37 - Manual (Page 20)

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Audio quality is poor and crackling noises
can be heard.
Bluetooth audio source is out of range.
Reduce the distance between the headset and
the Bluetooth audio source, or remove obstacles
between them.
I hear but cannot control the music on my
device (e.g. skip forward / backward).
The music device does not support this
feature (AVRCP profile).
Check the user manual of your audio source.
Please visit www.philips.com/support for
additional support.