Ok Glass! is like a keyword that gives instructions to the glass to do a task. But first let us know more about what is Google Glass?
Its a spectacle or a STYLED spectacle which is referred to as a computer which u can wear with a optical head-mounted display (OHMD) developed by Google.
Google has said the glass can be wearable by people with prescribed glasses or sunglasses and will have a tie up with retailers like Ray-Ban or Warby Parker to have demo devices for people to try on.
Google is a big name, read more about them here
For the developer Explorer units:Android 4.0.4 and higher640×360 displayvideo recordingBluetooth16GB storage (12 GB available)Texas Instruments OMAP 4430 SoC 1.2Ghz Dual(ARMv7)682MB RAM "proc".3 axis gyroscope3 axis accelerometer3 axis magnetometer (compass)Ambient light sensing and proximity sensorBone conduction transducer
Google offers a companion Android app called MyGlass, which allows you to configure and manage your device