f81a2720_ings___4G_LTE_Mobile_Broadband__Description
[light] MODE [Mode light] Green [Description] 
This indicator light is constantly green when the modem is connected to a 3G network, but no data is transferred. The indicator light flashes green when data is being transferred.
HUAWEI B593 4G LTE CPE Industrial Wireless Router Specs, Features and Settings | 4G LTE Mobile Broadband
Description