Huawei E8278 - USB Connector; Wi-Fi Indicator; SMS Indicator

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 USB connector
It connects the LTE Mobile WiFi Smart to a computer.
 Wi-Fi indicator
It indicates the status of a Wi-Fi network.
 Steady green: A Wi-Fi connection is set up.
 Off: The Wi-Fi function is turned off or fails, or the LTE Mobile WiFi Smart has been
removed.
 SMS indicator
It indicates the status of an SMS.
 Steady green: There are unread messages in your inbox.
 Blinking green once every 2s: The message storage is full.
 Off: The LTE Mobile WiFi Smart is powered off, there are no unread messages, or the
message storage is not full.