This light has no buttons and operates easily with one hand.
Slide your thumb or finger through the groove to turn it on/off.
Four Functions - High Power, Variable Dim, Low Power, and Strobe
Has a metal double gated s-biner so you can clip it to your keyring, backpack, jacket zipper, etc and always have a light with you.
Friends all wanted one, "cool little light."
Pros: cool factor, and no button to fail on you
This review was written in the old system and had content requirements that are different than reviews written today.