ARRIS SURFboard SB6183 Modem 16x4 Docsis 3.0 Cable Modem- Retail Packaging- White APPROVED with Comcast Xfinity, Spectrum (Charter, Time Warner, Brighthouse), Cox and more. If not sure call your cable provider to find out if approved to use. REQUIRES Cable Internet Service Not compatible with: Verizon, AT&T, or CenturyLink Cable Modem only (no WiFi router). 16 download & 4 upload channels Internet speeds up to 686 Mbps Download and 131 Mbps Upload based on your cable ISP subscription. Gigabit Ethernet port to connect to computer or router. Ideal for streaming HD Video and gaming on multiple devices at a time 2 year warranty. Supports IPv4 and IPv6  the latest Internet standard