This small but mighty M1 flashlight is the one model
in this series that calls for CR123 batteries. Not only do CR123
batteries have an extremely long shelf-life (10+ years) and maintain
high voltage for plenty of power, they also work well in extremely cold
temperatures where standard batteries can drain quickly. The M1 is a
great lightweight and powerful flashlight with the means to take on the
elements when necessary.
The Advanced Focus System (AFS) is the patented combination of a reflecto
AND lens to create a light system that provides both a focused beam for
long-distance and a homogenous spill-beam for up-close reading.