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.