The P3BL is our lowest profile model! Features a Precision blue laser sight with intensity/wavelength 4 mW peak, 450nm. Which is the Class IIIa and meets US FDA Safety Requirements. It is made out of aircraft alluminum alloy with a tan finish. Has a built-in lithium rechargeable battery, which is charged with a USB cord which is included! Very easy to operate. The model features ambidextrous on/off buttons. It will come with an Allen wrench for tuning the windage/elevation of the laser! Very easy to install to any picatinny rail!