Hunting Tactical .308 Brass Boresighter Cartridge Red Laser Bore Sight   Main Features: Easy and convenient to use with the high accuracy of bore sighting system Dead accurate sighting and zeroing your scope at 100 yards Sits perfectly in the chamber Durable solid brass construction Suitable for fast aiming and shooting at stationary and moving objects Powered by 3 x button batteries ( not included ) Maximum output power: Less than 5mW Wavelength: 635-655nm Note: 1. Do not look in the laser beam directly, or your eyes will be hurt 2. Never point a laser beam at a person 3. Don't aim the laser at reflective surfaces 4. Never view a laser pointer using an optical instrument, such as binocular or a microscope 5. Do not allow children to use laser pointers, unless under the supervision of an adult   Laser Wavelength(nm): 635-655nm Laser Power: Less than 5mW Power By: 3 x Cell Batteries ( not included ) Functions: Bore sighter Material: Brass   Package weight: 0.059 kg Product size (L x W x H): 4.60 x 1.20 x 1.20 cm / 1.81 x 0.47 x 0.47 inches Package size (L x W x H): 7.00 x 6.50 x 1.00 cm / 2.76 x 2.56 x 0.39 inches Package Contents: 1 x Hunting Tactical Red Laser Bore Sight, 1 x English User Manual