The IDG500-0T002 is a 4G LTE cellular modem with an Ethernet connection. It is suitable for internet failover and other applications where internet service is not readily available. The IDG500-0T002 can be coupled with the 4G LTE service options to provide a complete cellular solution. This unit is specific to AT&T. When an AT&T 4G LTE service option is purchased concurrently, Protectli will install the SIM, configure and test the unit before shipping.