Why won't my TK20R change modes?

The brightness levels, or modes, on the Fenix TK20R are changed by clicking the side switch. Holding down the side switch for .5 seconds while the light is on will activate strobe mode. 

If the light is not turning on, please check to make sure that you have removed the black insulation disc from between the battery and the tail cap. DO NOT REMOVE THE FILM FROM THE BATTERY.

While the light is charging, the side switch will glow and clicking it will turn the light on or off. The tail cap will not do anything while the light is plugged in.
If you find that your TK20R is behaving like this while the light is not plugged in to charge, please contact our customer service department by email, phone, or live chat.

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