NETGEAR CM400-100NAS Cable Modem DOCSIS3.0 Black for Xfinity Spectrum CoxNETGEAR CM400 cable modem certified by Cable Labs with DOCSIS 3.0 technology delivers download speeds up to 340Mbps, which is 8 times faster than DOCSIS 2.0. Features a single Gigabit Ethernet port for connecting to a router. Compatible with major U.S. cable internet providers including Xfinity, Spectrum, and Cox. Using your own modem instead of renting can save up to $156 annually in rental fees. Note: A separate router is required for WiFi poundsProductdimensions7.2 x 2.0 x 8.5 inches