It has 5 modes:
1.The brightest mode: It applies to study and work situation etc,working time is up to 10 hours.

2.Brighter mode: it applies to family work etc, working time is up to 20 hours.

3.Normal brightness mode: it applies to some social activity and walking etc, working time is up to 30 hours.
4.Dim light mode :it applies to bedroom for lighting 
5.Flash mode:when comes across emergency situation, it open this mode to get help.