Class IIIR laser product, 5mW power output. Unlike other laser bore sighting systems that insert into the muzzle of the firearm, these are precisely engineered to fit into the chamber, ensuring exact and consistent laser alignment with the bore. Save time, money and frustration. You'll be bore sighted and ready for live fire fine-tuning. You also can use this handy tool to check your zero after transporting your firearm to the range or hunting ground. Use the handgun versions to practice drawing and getting on target quickly. Sighting in your firearm has never been easier. Convenient, accurate and easy. If you feel like your firearm isn't quite hitting the mark like it used to, don't replace re-calibrate. All you have to do is chamber the unit as though it were a round and a red laser dot will show you exactly where your aim will land the shot. Be sighted in within minutes. Wave Length: 632-655nm Battery: (3) LR41 (Included) Battery Life: 1 hour maximum Range for Sighting: 15-100 yards Best Range for Sighting: 20-30 yards Dot Size: 2" at 100 yards Operation: On/Off End Cap Construction: Brass Power: Less than 5mW. Additional Details ------------------------------ Is autographed: false Is memorabilia: false Package quantity: 1