It is powered by 3 AAA batteries, which are held within the torch by a separate bracket in place. At my last torch was different because you had to first push the batteries into the main body and then screw down the lid. The two brothers L7 has the better solved first placed the batteries in the lock, and then pushed the shutter in the lamp body, thus there is no fiddling in the dark with batteries.
This lamp can also be morsen good! The power button on the back of the lamp can be a "monkey grip" good use with your thumb. This button has a little game way before the button for continuous operation engages. Unlocked the knob, he makes brief contact with the LED and can be re-let, pure press release. All in all great part!