Steam Link is a standalone device to enable streaming of Steam content from a personal computer or a Steam Machine wirelessly to a television, including integration of Steam Controller functionality. The device was released along with the debut of Steam Machines in November 2015.
Steam Link is listed as having the following technical specifications:
Wired 100 Mbit/s Fast Ethernet and Wireless 802.11ac 2×2 (MIMO)
3× USB 2.0 ports
Support for the following control peripherals: Steam Controller, Xbox One or 360 Wired Controller, Xbox 360 Wireless Controller for Windows, Logitech Wireless Gamepad F710, or keyboard and mouse.