Zoom 8x4 Cable Modem, 343 Mbps DOCSIS 3.0, Model 5345R (Certified Refurbished) This Certified Refurbished product is manufacturer refurbished, shows limited or no wear, includes all original accessories, and a 2-year warranty 343 Mbps cable modem provides very fast Internet over cable by connecting modems 10-100-1000 Ethernet port to your computer or router. OWNING THIS CABLE MODEM ELIMINATES MODEM RENTAL CHARGES (typically $8 to $10 every month) from Comcast XFINITY, Time Warner Cable, and other cable service providers. This 8x4 cable modem has eight downstream channels, four more than 4x4 cable modems, and gives higher average download speeds than 4x4 modems, even when the service speed is below this cable modems top speed of 343 Mbps. Works with Windows, Macintosh, and other Ethernet-capable computers and can also be used with wired and wireless routers. Works with all US cable modem services including DOCSIS 3.0, 2.0, and 1.1 services.