When shooting at close or medium ranges, a red dot sight is a great option for crossbow hunters. The TRUGLO Crossbow Red Dot Sight offers unlimited eye-relief, a wide field of few, and a compact design that are not available in magnified optics. FeaturesDescending Diameter Dots reticle for multi-distance shooting (smaller dot for longer shots)Unlimited eye reliefWide field of viewFlip-up lens caps / lanyard systemLightweight compact designEasy to mountIntegrated Weaver-style mounting systemBattery included (TG988C, 3V-CR2032)