The Holosun HS510C Multiple Reticle Red Dot Sight has a streamlined housing design with an open frame for a wide sight picture and minimized obstruction of vision. These Red Dot Sights by Holosun have an incredible battery life of up to 5 years, with advanced LED technology. They are powered by Advanced Super Solar Technology with battery backup. Equipped with a protective titanium alloy hood, the Holosun HS510C Circle Dot Scope with 3 Reticle Options is waterproof down to 1m and durable enough for even the heaviest calibers. When every shot counts, boost your accuracy and acquire targets swiftly with the Holosun HS510C Parallax Free Red Dot/Circle Sight.