The ARRIS SURFBOARD SB6121 is a high-speed Ethernet modem designed for cable internet connections. With a maximum downstream data rate of 1000 Mbps, it offers fast and reliable connectivity for your PC and other devices. The modem supports DOCSIS 3.0 standard and features a single LAN port for wired Ethernet connectivity. Its compact design makes it easy to set up and use in your home or office. Additionally, the modem comes with a manufacturer warranty of 1 month and is designed with safety features in mind, making it a reliable choice for your internet connection needs.