Google Glass is a unique, Android based computer with an optical head-mounted display. Google Glass uses a projector to display the interface in a hands-free environment. Users control the computer using voice commands. There is a touchpad on the frame to allow additional control. Google Glass can take photos and record video in 720p. When the camera is recording, a light is displayed to alert others when the glasses are recording. Google Glass is powered by a Texas Instruments OMAP dual-core processor which has a clock speed of 1.2 GHz.