The bipac 7820nz triple wan 3g4g lteadsl2 firewall router is integrated with the 80211n wireless access point and 4 port switch it is a cutting edge networking product for soho and office users its uniquely embedded dual sim card slot enables users to enjoy constant and seamless internet experience by simply plugging 3g4g lte sim cards into its built in sim slots without the needs of additional 3g4g lte usb modems one sim card is active and the other is backup it is perfectly suitable