How to set the Auto-lock time?
For Funtouch OS 4.0 and higher version, you can go to Settings>Display and Brightness>Auto-lock to set the Auto-lock time.
For Funtouch OS 3.2 and lower version, you can go to Settings>More settings>Auto-lock to set the Auto-lock time.
Warmly Tips: Under Low power mode, the Auto-lock time is 15s.