It´s the G1. It has a safety pin that must be inserted for it to run.
The pin is located in the back, on the screwing cap.
There is also a bar that can be removed (2 screws) to disable the G1.
I just used two alligator clips... one inside, clipping the spring (-) and the other on the case (+).
Battery included is 1300mAh, only lasts 30 minutes full on. (Got an extra one)
The G1 is quite powerful.. everyone who saw it running just goes WOW!! They can´t believe it is so bright being a hand held unit. I have already been asked many times to sell it in the 4 days of having it!