Nexus 7 tablet has the Android 4.1 as part of the brain, it is also called Jelly Bean. Besides the Jelly Bean, there is a set of services provided by Google, such as Google Now, Google Play, Voice Search, Google map, Google Plus, Chrome, YouTube, etc..
Most of these services are bound to user's Google account, and need network connection, which means, without Google account or network connection, these services would not be available. At the core is the Linux kernel 3.1.10. If you are curious, you may peek into the file system of the device.
The belly of the device is set of pieces of hardware, including the CPU, GPU, RAM, storage, camera, radio, the display, the battery, sensors, etc..
The CPU of Nexus 7 tablet is a quad core, working together with a 12-core Nvidia GPU and 1GB RAM. The Nexus 7 has a 7 inch display with 1280x800 resolution. The version of the tablet I got from IO has 8GB storage. It is said that the 16Wh Li-polymer battery can give 9.5 hours of backup.
The front-facing 1.2-megapixel camera can be used for video chat or taking low resolution photos, there is not rear camera.
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