The Walther Pro SL40 emits a 275-lumen beam, it is slim, short, but most importantly powerful. It is water-resistant rated (IPX 4) and being the smallest member of the Slim Line series measures just 108mm in length.
Beam Adjustment System
Light levels: 100%, 40%, 10% & direct strobe
Anti-reflecting aircraft aluminium
High-grade aluminium reflector and anti-scratch lens
Temperature Protection System
CR123 Lithium 3V battery
ANSI FL1 Standard - Technical Data
The American National Standards Institute (ANSI) published in 2009 the "Flashlight Basic Performance Standard", FL1 for short. So you can compare flashlights across manufacturer boundaries neutral. This lamp has been tested to stringent ANSI specifications.