Huawei U3220 User Manual page 46

--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.
Caution:
Changes or modifications made to this device not expressly approved by
Huawei Technologies Co., Ltd. may void the FCC authorization to operate this
device.
45