Thanks. There is a Two Fish holder directly just under the lens bezel of the Speed II light (blue light). It is there so that in case my extension wire or battery pack failed, I can easily remove these light and strap on my backup flashlight to my helmet. Very much spoken so correctly by noMotor:
Most of us that try a helmet light like them so much we don't like to ride without them.
I just cannot find my self ever riding without a helmet light.