The LMS-3XD Internal Laser Sight is for Springfield XD Sub-Compact 3-inch barrel 9mm or .40 S&W caliber pistols. It uses an LMS-319 battery, commonly used in watches. The laser’s accuracy at 15 yards is about 3 inches POA, and the laser operating temperature is 15 to 120 degrees Fahrenheit. The wavelength is 635nm (red-orange), the power output is 3mW, and the spot size at seven yards is 5/16 of an inch and at 25 yards is 3/4 of an inch.