Dell BH200 Bluetooth 2.0 EDR Stereo Headset - Manuel (Page 84)

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Any changes or modifications (including the antennas) made to
this device that are not expressly approved by the manufacturer
may void the user's authority to operate the equipment.
FCC RF Radiation Exposure Statement: This equipment complies
with FCC RF radiation exposure limits set forth for an
uncontrolled environment. This device and its antenna must not
be co-located or operating in conjunction with any other antenna
or transmitter.