The ARRIS SURFboard SB6183 is a black DOCSIS 3.0 cable modem designed for use with Xfinity, Spectrum, and Cox internet services. With a maximum downstream data rate of 686 Mbps, this modem offers fast and reliable internet connectivity for home or office use. It features one Ethernet port (RJ-45) and a compact design with dimensions of 5.25in in length, 5in in height, and 2.17in in width. The SB6183-RB model is unlocked and manufactured in China by ARRIS, a trusted brand in the industry.