Read the first post in the thread I linked to. As I use it it has 6 modes. Very Low, Low, Medium, High, Very Low, and 5 second beacon (where it flashed every 5 seconds).

If you just click it on and off it will stay in 1 mode. It remembers the mode you were in last when you turn it back on. So you have an on off flashlight if you want.

If you don't want it that's fine. I value being able to dim the light for reading and long runtime, but still having a flashlight that can be WAY brighter than a 5mm led light like the Gerber.

I have the Gerber on my key chain, but it's mostly a spare battery carrier to my other lights and an extreme back up if they break.