Huawei B525 - Installing External Antennas

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2. Installing external antennas
You can install external antennas to improve signal reception. Please
contact your network service provider to purchase the antennas. If you
only require one antenna, plug it into the
socket.
 Turn off the Mobile Internet Router and unplug the power adapter
before installing any external antennas.
 External antennas are only suitable for indoor use. Do not use
external antennas during thunderstorms.
 Only use external antennas provided by your network service
provider.