The MJ-880 is a very easy light to use. The clicky switch is top mounted and also illuminated by a colour coded LED which reflects the amount of charge remaining.
Green = 100 - 70%
Blue = 70 - 40%
Red = 40 - 10%
Flashing Red = less than 10%
Pressing the left side of the switch starts the light on it's lowest setting (10%). The click the right side to scroll through intermediate power levels (25%, 50%, 75% and 100%). To reduce power simply select the left side of the switch.