Check the listing for details. INSIGHT TECHNOLOGY .50 cal Laser Borelight System LBS AN/PEM-1 kit. Condition: Used. Listed at 150.00 USD. Enhance your accuracy with the INSIGHT TECHNOLOGY LASER BORELIGHT SYSTEM LBS SIGHT ZERO MULTI-CALIBER for the .50cal. This high-quality bore sight system is perfect for hunting and shooting enthusiasts. The laser technology helps to align your firearm with precision and accuracy without compromising on safety. The INSIGHT TECHNOLOGY LASER BORELIGHT SYSTEM LBS SIGHT ZERO MULTI-CALIBER is a top-quality product that is made in the United States. It comes with a brand name that is known for its reliable and durable products. This laser bore sight system is perfect for various caliber firearms and can be used by both novice and experienced shooters. Get your hands on this amazing product today and take your hunting and shooting game to the next level. These are used mil surplus units. You will receive ONE unit. I understand the pics have multiple units in them. We do this to show the condition of the units as we have many units so you may not receive the exact unit pictured but one similar. Again, you will receive ONE UNIT. Please ask questions if you do not understand this and we will help. Specifications: Dimensions 3.8″L x 1.25″ W x 2.3″ H Weight 4.5 oz. with AA battery Power (1) Standard 1.5v. Alkaline Battery AA Battery Life 8 hr. Operating Temperature -51 F to 120 F Visible Laser Output Power .9mW (Class II) Beam Divergence .5mrad Wavelength 650 nm (nominal) Contents: -Laser Bore-light Assembly There are 2 Laser Bore-light Assembly Models. Both versions of the Laser Bore-light System were designated for different branches of the military. The 300 for the Army, the 050 for the Marine Corps.