New, never used Cable Modem. It also has Wi-Fi functionality so you won't need and extra router for using internet. It works with major US cable providers such as Xfinity, RCN, ... Details: A high-speed internet experience that's quick, easy and economical 2 products in 1 - The SURFboard SBG10 combines a DOCSIS 3.0 cable modem with an 802.11ac Wi-Fi router with 2 one-gigabit Ethernet ports. It has 16 downstream and 4 upstream channels and AC1600 Wi-Fi, making it a perfect choice for homes with less devices to manage. The all-in-one modem & Wi-Fi router combo means no more managing multiple devices and is best for Cable Internet Speed Plans up to 400 Mbps. Plus, it saves you money on monthly modem rental fees and fits easily into any home office.