3Pack C8 Flashlight Xm l T6 Led 800lm 5 Mode Torch (Batteries Not Included)

Specification:
Brightness: 1000LM
Special Features: Tactical
Modes: 5 modes
Mode Arrangement: high / mid / low / fast strobe / SOS
LED lifetime: 100,000 hours
Switch type: Tail cap switch
Meterial: Aluminium Alloy
Size: 7.5 x 7 x 1.5 inches
Net Weight: 3.77 oz (107g)
Color: Grey
Package contents: 3x Flashlight(battery not included)

How do you change the modes on this flashlight
1.Fully depress the on off switch completely twice within 3 seconds
2.Just a light press to bounce the button