The HE515CT-RD is an ultra durable, titanium, 20mm micro sight designed for hard-use rifle and carbine applications. The HE515CT-GR is made from grade 5 titanium and includes clear, removable/rotating lens caps, a QD absolute co-witness (1.41) mount, and is IP68 certified waterproof and dustproof rating with Solar Failsafe technology. Additional features include our MRS (Multi-Reticle System) with Green Super LED, 10 daylight and 2 night vision compatible reticle intensity settings, Shake Awake technology, and up to 50k hour battery life. The 2032 battery is housed in a side mounted tray for easy access. The HE515CT-GR is designed for sporting and professional users.