HOLOSUN HS403G Paralow Micro Red Dot Sight with T1 Mount/High E/W Turret LED technology allows 50,000 hours of operation on one battery; auto on with movement and auto shut off after 8 hours (Also has manual off) Battery housing on right side of optic provides easy access to battery Turret adjustment mechanism is 3mm higher than the HS403A, to make it easier to adjust with a gloved hand Parallax free when the red dot is on the target resulting in 2MOA dot size, high quality, clear lens with crisp, bright red dot Fully waterproof and submersible to 100 feet New LED technology allows 50,000 hours of operation on one battery; Auto-On with Movement and Auto Shut-Off after 8 hours (Also has Manual Off) Battery housing on right side of optic provides easy access to battery Turret adjustment mechanism is 3mm higher than the HS403A, to make it easier to adjust with a gloved hand Parallax-free; when the red dot is on the target, so are you; 2 MOA dot size; High quality, clear lens with crisp, bright red dot Fully waterproof and submersible to 100 feet; High strength aluminum, MAO finish; LIFETIME WARRANTY