ARRIS SURFboard SB6121 4x4 DOCSIS 3.0 Cable Modem -Retail Packaging-Black Compatible with Time Warner Cable, Charter, Cox, Cablevision, and more Not compatible with Verizon FiOS or AT&T U-verse, no longer approved by Comcast Xfinity Requires Cable Iternet Service, if not sure your provider is CABLE call them to confirm BROWN BOX models NOT VALID for this item when sold as New, should report to Amazon immediately and RETURN to Seller Wired modem only, does NOT include WIFI Router or VOIP Telephone adapter. Gigabit Ethernet port to connect to computer or Router for fast downloads. Internet speeds based on your Cable providers service - up to 172 Mbps download and 131 Mbps upload. 4 Download and 4 Upload Channels.