4G LTE Failover is a data SIM card.  Kinect will provide you with a SIM card for free with the activation of a new account, however, if your router does not support a SIM slot for a secondary (or failover) WAN, then you will need to purchase a LTE Router.  We carry many different brands that support one to three SIM cards and can be configured in a variety of ways.  Please call for me information.