With this penlight, Brightness is written with a capital B. The size of a ballpoint pen, the P4 looks rather ordinary when you place it securely in your shirt pocket using its handy clip. But its light output is more than impressive: Up to 18 lumens are cast into the darkness, extending as far as 25 m, and its special lens creates a full beam of light with an unmistakable blue edge. https://www.youtube.com/embed/gtloiUCom3g?modestbranding=1&showinfo=0&rel=0&iv_load_policy=3 Power LED This LED enables your Ledlenser to achieve high luminosity. Light Functions These settings are pure and bright: Power - optimised light output Switches Turn, press or both - how to switch these Ledlensers on: End Cap Switch - a switch on the end of the light (end cap) Special Functions That special something about this Ledlenser: Advanced Focus System - single-handed adjustment of the focus to put light where it is needed Increased Battery Life - efficiency technology to optimise overall run time IP-Class Safety features of this Ledlenser: IPX4 - protection against water splashing from any direction Casing So that you can enjoy your light for a long time, every Ledlenser casing is made of high-quality metal. In this instance, it's aluminium to ensure especially light handling.