Huawei E5771h-937 - Device Appearance and Controls; Power Button Operations

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Appearance
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 Power button
 Press and hold the power button until the indicator lights up, indicating that the Mobile
WiFi Pro2 (Mobile WiFi for short) is turned on.
 Press and hold the power button for at least 10 seconds to forcibly power off your Mobile
WiFi.
 Press and hold the power button for 15 seconds to restart your Mobile WiFi.