Overall, it's an OK switch for the TK26R, but... If the light is off and you try to activate the strobe feature via this switch, it weakly and slowly pulses like the battery is about to die. When the flashlight is already turned on, the strobe works, but it stays on. You have to click it back off. When using the TK26R without this switch, the light can be off and the strobe functions and it is on momentarily, as it should. The packaging says the strobe feature will work. It does not work in a way that is practical or as the light itself was designed.