Baicells EG8015Q-M11 Configuration Manual page 7

 Wifi signal light
Arc logo ，Three lights indicate wifi signal strength according
to the number of lights, full light indicates strong signal; full
out when not connected
 Lte signal light
Vertical logo
according to the number of lights, full light indicates strong signal;
flash when not connected
 Power light
The power light is bright, indicating that the power supply is normal,
otherwise the power supply is abnormal
 Sim light
Light on -> Insert the normal SIM card;otherwise no sim nor sim is
bad.
 Lan light
Light on -> LAN port is connected
， Three lights indicate lte signal intensity