J-Tech Tactical Green Laser Sight with Mounts has a 532 nM 5mW Green Laser that shoots a precision beam visible up to 100 yds. in broad daylight! Visible up to 1 mile at night! For the serious shooter, this combat tactical unit, with Mounts, offers unmatched performance. On target in an instant, using only 2 fingers. Unlike others out there, this has separate X axis and Y axis adjustment, and can lock into place once zeroed. " Rugged, aircraft-grade 6061 anodized aluminum housing. With reinforced internals so it resists recoil "rattling" off-target " Tactical on / off pressure switch with approx. 10" cable " Comes with rail mount plus universal barrel mount " Hand-adjustable windage and elevation can be locked in position with set screws " Uses long-life 3V CR123A lithium battery (included) " Measures 4 1/2" long, weighs 7 1/2 ozs.