Despite the way it looks at first glance, there's only one battery required for the TLR-2 G. The operation switch is located on the battery cover, and the unit must be removed from the gun to replace a dead cell.
The activation switch has texturing on the outside, although it's paddle-style of operation makes turning on the unit sure and fast, even with gloved hands. An accessory pressure-pad switch is also available for the TLR-2 G.
The hole in the LED housing’s reflector looks odd at first, but that’s the place from which the green laser is emitted. With one less place to be exposed to the elements, it probably makes the unit a little more rugged, but it does make it even more important to keep that polymer lens clean.