This Motorola/Arris SURFboard (SB6121) is a high-quality cable modem that is compatible with Comcast Xfinity. It features a DOCSIS 3.0 standard and is designed to provide reliable and fast internet connection. The modem is made by Motorola and is part of their SURFboard eXtreme line.

This modem is perfect for anyone who is looking to upgrade their internet connection. Its sleek design and advanced features make it a great choice for anyone who wants a reliable and fast modem. The modem is easy to install and is compatible with a wide range of devices, making it a versatile choice for any home or office.