Right click on the show time 

Under the right according to the two-display the date 

Left click on the display light and strong light time(maximum 2 -3.5hours) 

Under the left key press two-show weak light and weak light time(maximum 9 hours) 

Left by the three--shut off the power 

Key about long press shows SOS distress signal at the same time 

Right-click adjustable time date long right click right click on time flash adjustment, adjust the next, then right click to flashing adjustment and so on.

Long press the left key show flash.