That is the X300 with a DG-11 switch attached to it.

However, I would recommend you get the newer model the X300 Ultra with a much more powerful beam. Mine has 170 lumens, the new one has 500 lumens.

I will be getting the new model eventually, it wasn't out yet when I bought that one pictured above.

No, 500 lumens will not blind anyone, but it sure makes a difference!