Also on the bottom is a small removable door that hides a storage slot for the 2.4 GHz wireless dongle for travel. (windowscentral.com)
The Stealth 700 comes with a USB wireless dongle which hooks up to the PS4's optical input, with which it was paired out of the box; manual pairing proved simple enough. (techradar.com)
The controller connects via wireless dongle or USB cable on Windows, but it can connect to Steam Machines without any extra peripherals. (tomsguide.com)