About this item
Class IIIA laser, less than 5mW 
Made to fit the 9mm chamber, caliber specific. 
Comes with 1 set batteries (3 AG3 batteries) which can last one and half an hour 
Easy to sit perfectly in the bore. Sturdy brass construction. Fast gun zeroing and sighting. 
High accuracy to reduce cartridges and shells wasted, sighting range of the bore sight is 15 to 100 yards.