GlobalLink 520 4G LTE-M Remote Monitoring Device with 5-Year Pre-Paid SIM Card Uses AT T T-MobileWe believe that having insight into your installation is a key factor in maintaining and operating your off-grid energy solutions. Off-grid should not mean off-line, so we have created the GlobalLink 520. This device will bring 4G LTE-M connectivity to all VE.Direct enabled devices without any monthly fees or subscriptions, for the first five years. Global Connectivity with 4G LTE-MLTE-M is the abb