The Rifle Blue Laser is an engineering masterpiece. Green lasers notoriously use quite a bit of energy, burning batteries fairly quickly whereas the blue laser uses less than half of the energy to produce the same output. Red and green lasers alike succumb to low temperatures unless rated for this use and are quite expensive and the blue laser is not bothered by temperatures low or high. This is considered an HEV or high-energy visible laser that produces a true 500nm making it the most visible spectrum of light available to the retina. The Osprey Rifle Blue Laser comes with a picatinny mount, on/off switch, and momentary pressure switch. It is backed by Osprey’s industry leading no-nonsense lifetime warranty.