The SC-R uses a 5-milliwatt, 635 nanometer red laser to sight up to 457 meters away. The laser is controlled by two side-positioned ON/OFF buttons for left and right-handed use. Ideal for rail-equipped compact and subcompact pistols. It has an adjustable hinge mount design; no tools required. Ideal for rail-equipped compact and subcompact pistols. Feature bottom mounted lock out switch for carry and transport. Range 457 yds Finish Black Series Q-Series Weight 1.80 oz Dot Size 0.50"-1.00" at 20 Yards Mount Type Accessory Rail Wavelength 635nM Firearm Fit Compact, Subcompact Pistols Laser Color Red Battery Size CR2