f81a2720_ings___4G_LTE_Mobile_Broadband__Description
[light] MODE [Mode light] Orange [Description] 
This light is constantly orange when the modem is connected to a 2G network, but no data is transferred. The indicator light flashes orange when data is being transferred.
HUAWEI B593 4G LTE CPE Industrial Wireless Router Specs, Features and Settings | 4G LTE Mobile Broadband
Description