Always on and never off No batteries required All metal sight Combines Truglo fiber optics with the illuminating properties of ritium. Always on and never off - perfect for all shooting conditions. No batteries required. Not affected by temperature extremes. All metal sight.table.productattributes, .productattributes td { border-bottom: 1px solid #ddd; border-collapse: collapse; padding: 2px; text-align: left; } Stockable: Y Country Of Origin: US