Huawei E3531 - USB Connector; LED Light Status; SIM Card Slot; Micro-SD Connector

1
2
USB connector.
3
LED light.
Indicates modem status.
= Connected
- Blinking green light
= Connecting via 2G
- Fixed green light
= Connected via 2G
- Blinki ng blue light = Connecting via 3G
-
Fixed blue light = Connected via 3G
4 Micro-SD connector. (Memory card)
SIM card slot
15
UK