Any operator can use the Cudy LT400 4G LTE N300 300 Mbps WiFi router with a SIM card slot for FDD and TDD, DDNS, and PPTP/L2TP VPN. Contents of the product package: A single 4G LTE router and a single power supply. An additional SIM card adapter An Ethernet cable, one - One set of installation instructions (not all in English). B1, B3, B7, B8, and B20 are 4G LTE FDD (2100/1800/2600/900/800MHz). 4G LTE TDD: 2600/2300 MHz, B38/B40. DC-HSPA +/HSP 3G