Descriptions: 

1.New laser boresighter for your 12 gauge shotgun.

2.Unit includes three new batteries for immediate use.

3.Sighting or zeroing in your iron sights, red dots, or scopes quickly and easily.

4.Sits perfectly in the chamber

5.Quick and easy sighting and zero

6.Precision Laser Optics

7.No more wasting ammo

Specifications: 

1.Material: High Quality Brass

2.Power: Less than 5 megawatts

3.Wavelength: 635-655NW

4.LED Type: Visible Red Laser

5.Boresighter laser:Red

6.Batteries Type: 3 x LR44 Button

7.Sighting Range: 10-100yards

8.Dot Size: 1.5" @ 100 yds

9.Whole length: 60mm(2.37'')

10.Wavelength: 625-660nm

http://www.sabretacticalsupply.com/