Viridian's E SERIES laser sight is specifically designed for the everyday conceal and carry owner. This model specific, trigger guard mounted, laser sight offers the most powerful green laser legally available, delivering rapid target acquisition when you need it most.Easy installation onto the trigger guard of your pistolAmbidextrous on/off button with 5 min auto shut off25 yard range in daylight and 1 mile at nightConstant laser with 60 min battery lifeEasy windage and elevation adjustmentFits the Ruger 57.Features: Series:E SeriesLED Light Color:GreenWeapon Brand:RugerActivation:On/Off OnlyAdjustable:Windage/ElevationBatt. Life (constant):1 HourColor:BlackHolster Included:NoMaterial:High Strength Thermo Molded PolymerLaser Color:GreenMounting:Trigger GuardRange:Up to 25 yards daylight / 1 mile nightStrobing Effect:NoWarranty Length:7 years