Huawei UM840 Manual page 154

radio frequency energy and, if not installed and used in
accordance with the instructions, may cause harmful
interference to radio communications. However,there is no
guarantee that interference will not occur in a particular
installation.If this equipment does cause harmful interference to
radio or television reception,which can be determined by turning
the equipment off and on, the user is encouraged to try to correct
the interference by one or more of the following measures:
--Reorient or relocate the receiving antenna.
--Increase the separation between the equipment and receiver.
--Connect the equipment into an outlet on a circuit different from
that to which the receiver is connected.
--Consult the dealer or an experienced radio/TV technician for
help.
This device complies with Part 15 of the FCC Rules. Operation
is subject to the following two conditions: (1) this device may not
cause harmful interference, and (2) this device must accept any
interference received, including interference that may cause
undesired operation.
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