Industrial Cellular Modem  TRM250 is an industrial-grade USB LTE Cat-M1/NB-IoT/EGPRS modem with a rugged housing and an external antenna for better signal coverage. This product is perfect for providing cost-efficient internet connectivity in remote monitoring applications. Connectivity  4G/LTE (Cat M1), NB-IoT, 2G Compact and Durable  Small size, easy installation USB Interface for Internet access External Antenna  For deployment flexibility