This Zoom DOCSIS 3.0 Cable Modem Model 5341 provides very fast internet over cable for your computer or router, supporting download speeds up to 343 Mbps and upload speeds up to 123 Mbps. It works with Windows, Macintosh, and other Ethernet-capable computers, as well as wired and wireless routers. The modem supports IPv6 and IPv4 for flexible network addressing and is CableLabs certified for FCC and safety standards. The modem shows minor signs of use but is fully functional and comes with its original packaging.