Huawei E5151 - Device Indicators and Ports; Network, Battery, and Message Indicators; Micro USB Port

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 Signal indicator
 Green: Strong signal.
 Orange: Weak signal.
 Red: No signal.
 Wi-Fi indicator
Green: Wi-Fi turned on.
 Battery indicator
 Green: Sufficient battery.
 Blinking green: Charging the battery.
 Red: Low battery.
 Messages indicator
 Green: New message.
 Blinking green: Inbox full.
 Micro USB port