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The LaserLyte CR2 Batteries 3-Pack BAT-CR gives you power in bulk for your laser sights. The CR-2 battery is for use in LaserLyte laser sights including the Kryptonyte Laser Bore Sighter (LBS-HULK-140) and the Kryptonyte .50 BMG Laser Bore Sighter (K-50). This compact batteries are easy to bring along on hunting trips. Always have an extra battery on hand with this LaserLyte Battery multi-pack.