100% Risk Free, Lifetime Warranty The Monstrum Tactical Laser Bore Sighters are precision machined from high quality aluminum ensuring a perfect fit in the chamber and true aim when adjusting optics, sights, etc. Each comes packaged with the necessary batteries and is immediately fully operational. Remove the batteries to turn off the laser and store for future use. Brand: Tiger Rock Includes: (3) LR41 button cell batteries Compatability: .223 Chambers LED Type: Visible red laser Laser wavelength: 635-655 nm Laser beam: < 5mW Sighting range: 20-30 yards Dot size: 1.5" @ 100 yards Warranty: Lifetime