Huawei E8278 - 2 G;3 G;LTE Indicator; MicroSD Card Slot

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 2G/3G/LTE indicator
It indicates the LTE Mobile WiFi Smart's status.
 Blinking green twice every 2s: The LTE Mobile WiFi Smart is powered on.
 Blinking green once every 0.2s: The software of the LTE Mobile WiFi Smart is being
upgraded.
 Blinking green once every 2s: The LTE Mobile WiFi Smart is registered with a 2G network.
 Steady green: The LTE Mobile WiFi Smart is connected to a 2G network .
 Blinking blue once every 2s: The LTE Mobile WiFi Smart is registered with a 3G network.
 Steady blue: The LTE Mobile WiFi Smart is connected to a 3G network.
 Blinking cyan once every 2s: The USB Stick is registered with a LTE network.
 Steady cyan: The USB Stick is connected to a 3G+/LTE network.
 Off: The LTE Mobile WiFi Smart is removed.
 microSD card slot
It holds a microSD card.