2 MOA red dot for precision and fast target acquisition; Battery life: 30,000 hours (over 3 years) of constant operation with one battery on setting 7; Battery type: DL1/3N battery (included); Front lens opening is threaded for addition of killFlash(R) anti-reflective device (ARD); Retainer straps for adjustment caps; Hard anodized non-reflective surface 10 brightness settings: 4 night vision compatible settings and 6 daylight settings; 1X (non-magnifying) operationally parallax free optic; Submersible to 150 feet (45 meters); Temperature span -49F to +160F; Weight 6.8 oz / 194 g (sight only)