VIRIDIAN GREEN LASER: This compact green tactical laser utilizes a precise 532nm wave length for a more visible targeting dot in day or night, indoors or outdoors. Class 3R Laser Product (Does not exceed Class IIIA emission limits), ? 5mW power output ECR INSTANT ON: Includes a sleek Instant-On ECR holster that activates the world's brightest laser when drawn. No fumbling with buttons in critical situations. When you draw, it's on! LASER RANGE: The green laser sight creates a visible target up to 2 miles at night and up to 100 yards in daylight. This laser is powered to the maximum legal strength. BATTERY LIFE: Up to 2 hours of constant green laser time. Includes a dual color low battery indicator. CONSTRUCTION: Built specifically for the Glock 43 from high strength thermo molded polymer, this tactical green laser is only .78 oz. including the battery. Virtually Weightless!