How to set up Extreme power saving mode on my HTC Desire 510

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Turn Extreme power saving mode on to extend the battery life of your HTC Desire 510. You can change the level at which you want Extreme power saving mode to start.
1. To alter the Extreme power saving mode settings, touch Apps.
2. Scroll to and touch Settings.
3. Scroll to and touch Power.
4. Touch Extreme power saving mode.
5. Touch Automatically turn on extreme power saving mode…
6. Touch Extreme power saving mode.
7. Read the information and touch OK.
8. Extreme power saving mode is on.
9. To turn Extreme power saving mode off, touch Exit.