Main Features:Easy and convenient to use with the high accuracy of bore sighting systemDead accurate sighting and zeroing your scope at 100 yards.Sits perfectly in the chamberDurable solid brass constructionSuitable for fast aiming and shooting at stationary and moving objectsPowered by 4 x button batteries (included)Maximum output power: Less than 5mWWavelength: 635-655nmNote:1. Do not look in the laser beam directly、 or your eyes will be hurt2. Never point a laser beam at a person3. Don\\\'t aim the laser at reflective surfaces4. Never view a laser pointer using an optical instrument、 such as binocular or a microscope5. Do not allow children to use laser pointers、 unless under the supervision of an adult Laser Wavelength(nm): 635-655nmLaser Power: Less than 5mWMaterial: Brass Package weight: 0.046 kgProduct size (L x W x H): 2.90 x 1.00 x 1.00 cm / 1.14 x 0.39 x 0.39 inchesPackage size (L x W x H): 4.50 x 4.50 x 1.00 cm / 1.77 x 1.77 x 0.39 inchesPackage Contents: 1 x Hunting Tactical CAL .40 Brass Boresighter Cartridge Red Laser Bore Sight4 x Cell Batteriy1 x English User Manual