Class IIIA, less than 5mW 632-650nm red dot laser. laser bore sight is suitable for 12 gauge chamber, caliber specific. Easy to use, bore sight kit make the red dot sight to zero much faster. Saved your time and ammo. Specification: Length:60mm; Tail width: 22mm; Head width: 20mm Laser Wave length (nm:) 632- 650 Laser Type: visible red laser Power: <5 mW Construction: Brass Range of the Sighting: 15- 100 yards Temperature: -10℃ to 40℃ Battery Type:6 X AG13/LR44 (Included)