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*Production Package may be different than the one pictured.* Specifications and Features: Sightmark SM39006 Chamber Laser Bore Sight .300 Winchester Magnum Brass Carrying case Instructions Laser Wavelength: 632 - 650 nm LED Type: Visible red laser Output Power: 5 mW Battery Type: AG5 (2) Battery Type: AG3 (3) Battery Life:1 hour Range for Sighting: 15 - 100 yds Dot Size: 2 in @100yd Operation: On/off end cap Material:Brass Operating Temp F: 14 to 122