ARRIS SURFboard SB6141-RB 8x4 DOCSIS 3.0 Cable Modem (Certified Refurbished) Approved on Comcast Xfinity, Spectrum (Charter, Time Warner, Brighthouse Networks), Cox, Mediacom, Suddenlink and most other US Cable Internet Providers. NOT compatible with Verizon, AT&T or Centurylink. REQUIRES Internet Service. Wired modem only. Does not include WiFi router or VOIP Telephone adapter. Gigabit Etherent port to connect to PC or Router. 8 Download Channels and 4 Upload Channels capable of up to 343 Mbps download and 131 upload speeds. Recommended for Internet Plans up to 100 Mbps. Supports both IPv4 and IPv6, the latest standard. 90 Day Warranty. ARRIS Certified Refurbished. US Technical support. ARRIS Certified Refurbished products will ALWAYS be branded ARRIS, Never Motorola! If you get Motorola branded product they are illegitimate, need to be returned to Seller and Reported to Amazon