jarvis959You can half press the button on the end to switch between the low-medium-high. It is a physical click to turn it on and off but not to switch between modes. I use this thing almost everyday. I like this model and the AA Prince model. Both have the same UI except the Prince can get like 800 lumen out of a double-a rechargeable somehow. The prince has some throw while this one is good for indoor use or in the yard at night. Nothing crazy but good EDC and perfect for snooping around in computers and such.