HTC One M8 for Windows - Manual (Page 53)

§ Now until next charge. Battery Saver turns on instantly until
the next time you recharge the battery.
§ Always. Battery Saver is always on.
5. Press to save your settings.
Using the onscreen keyboard
When you start an app or select a field that requires text or numbers, the
onscreen keyboard becomes available.
Tap anywhere onscreen where you can type and the keyboard appears
automatically.
After you've finished using the keyboard, press to close it.
Turning caps lock on
Press and hold or double-tap the shift key . Tap it again to turn caps
lock off.
Your first week with your new phone 53