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Only works with Comcast rented routers and modems. Not suitable for consumer owned routers. In essence, if you do not rent your modem or router monthly from Comcast, this device cannot be used, as it is incompatible with your network configuration. Plug-In and Simple Self-Installation. Self-Optimizing Network. More Reliable WiFi Coverage Aids in eliminating dead spots for more consistent coverage. Operates seamlessly with your xFi Gateway to form a mesh WiFi network. Optimizes and adjusts to your home's WiFi requirements. Effortlessly monitor and manage your WiFi activity on your home network via the xFi app