How to turn Extreme power saving mode on and off 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. In this mode, standby time can last longer than usual, and you can only use the most basic functions such as phone calls, text messaging, and email.
1. Swipe down to open the notification area.
2. Touch Quick settings.
3. Touch Extreme power saving mode.
4. Read the information and touch OK.
5. Extreme power saving mode is on.
6. To turn Extreme power saving mode off, touch Exit.