Eye Relief: Free & High Durability aluminum alloy. Reticle: Red and Green Reticle with 10 Levels Brightness, auto shut-down. * Field of View (@100yds): 30 yards. Power safe feature, automatic power-off in 2 hours. * Easy to setup, fits in any 20mm rail. Power Supply: Two pieces of AA battery * Unbranded. Generally meant for Air Soft, but does not only work for Air Soft; Others as well. You can try it. People have witnessed. * BRAND NEW!!! TOP QUALITY!!! Only "Flemo Seller" offers RETURNS AND includes BATTERIES!!! For Bulk quantity, please contact "Flemo Seller".