[Upgraded Laser Bore Sight]: Upgraded version improves its accuracy and stability, longer sighting range, allows you to quickly and accurately target any scene or object. Laser class: IIIa. Max. Output Power:＜5mW. [Ultra-long battery life]: After testing and comparison, we have selected the upgraded CR2 batteries with longer battery life and longer service life than others, providing you with a better experience. [Big button switch, easy to use]: Big and sensitive button switch, just lightly press to turn ON/OFF the laser, easier and more convenient to control. Comes with tools, only need to choose appropriate size adapter and place the laser unit in the muzzle. [16 adapters fit for more models]: EZshoot Red Laser Sight Contains 16 adapters and 1 arbor, fit for 0.17 to 12GA caliber. Arbor suitable for .54-.79(#10-#16) calibers make the laser bore sight stable. [Light weight and sturdy]: Adapt with superior materials, excellent metal structure design and assembled by professional craftsmen, it is sturdy and has long service life of trouble-free use. Compact design for convenient to storage.