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The SL-500 is ideal for the professional hunter, shooter, or gunsmith. The SL-500 uses an ultra bright green laser which is 50 to 100 times brighter than red lasers, and is much easier to see in daylight. The SL-500 uses one DL 123 Lithium Battery (included) that provides a battery life of up to 10 hours (continuous use). The SL-500 uses the latest laser technology to provide superior boresighting accuracy. Super-strong magnets in the arbor securely centers the laser for consistent accuracy. A unique system of adapters and O-rings fit just about everything. To boresight, level the scope with the included Scope Reticle Leveler and Leveling Target. Then input your specific data into the included Ballistic Targeting System software program to create a custom laser boresighting target. Next, place the laser spot on the target, align your scope with the target crosshairs and you’re boresighted for up to 300 yards.