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Inverted rendering/reverse colors
If you use your Android device at night or in adverse lighting situations, this setting will become your best friend. It reverses colors rendered on the screen, eg black to white. This makes it much easier to read the screen in the dark.
Besides the obvious, displaying black screens has an unexpected benefit. Rendering dark pages uses less power than light pages.
Personalized voice recognition
Not everyone likes to tell Android what to do by voice, but those used to dictating search queries and other input realize how good Android’s speech recognition has gotten. It’s not perfect, so there’s a way to get Android to learn what you tell it over time, and get more accurate as a result.
The personalized voice recognition is buried in the settings so it’s a little hard to find. Under the “Language and input” section you should find “voice search”. The “Personalized recognition” setting is a toggle that activates the learning process. Anything it learns about your speech input is associated with your Google account.
Chrome browser bandwidth management
If you don't use the Chrome browser on Android devices, you probably should. It has evolved into a mobile powerhouse for surfing the web.
One of the nicest features in the Chrome browser settings is bandwidth management. Android device owners do a lot of surfing the web, and that can use a lot of data bandwidth.
Enter Chrome for Android to help reduce the data used by the browser. Under settings there is a section labelled "bandwidth management". Here you can restrict the browser from preloading pages unless on Wi-Fi.
Even more powerful is the "reduce data usage" setting. This uses Google's servers to compress web pages, reducing the amound of data served. This can save you quite a bit of data consumption over time.