The SureCall M2M 4G LTE industrial quality signal booster delivers optimum cellular signal enhancement for all machine-to-machine applications. The SureCall M2M 4G LTE industrial quality cellular signal booster for machine-to-machine applications increases critical 4G LTE signal for Verizon or AT&T. It is designed to be connected directly to a modem or data card. The M2M booster features sturdy metal construction and an industry leading 3-year warranty.