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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
Technical specifications
For the developer Explorer units:Android 4.0.4 and higher640×360 displayvideo recordingBluetooth[6]16GB 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