Requires cable internet service. Compatible with major U. S. Cable Providers like Xfinity, Spectrum, Cox, Suddenlink, Mediacom, etc. Not compatible with ATT, Verizon or CenturyLink. 32 DOWNLOAD & 8 UPLOAD channels to future proof your modem as your Cable ISP enhances service offerings. Recommended for plans of 300 Mbps and aboveSupports IPv4 and IPv6 ?C the latest Internet standard90 Day Warranty. ARRIS Certified Refurbished. US Technical support