A player connects the Rift to a PC via USB and HDMI, and the PC's graphics processor renders side-by-side 3-D images. The 11-ounce goggles contain a seven-inch LCD that displays both images. A pair of aspherical lenses separate them to create a 3-D effect with a field of view that's 90 degrees wide and shifts with a player's head movements. A sensor containing a gyroscope, accelerometer, magnetometer, and microcontroller tracks the pitch, yaw, and roll of the player's head. The sensor registers movement every millisecond (off-the-shelf sensors take up to four), so the image can refresh within two milliseconds.