This 1 AA Mini-TAC light use a deep parabolic reflector creating a tight, long throw beam for distance illumination. With a water resistant design, it is constructed from aircraft-grade 6061-T6 aluminum with a Type II hard anodized finish. The tail switch provides momentary or constant-on functionality. The light comes with a removable pocket clip and a removable wrist lanyard. The MT-110 is powered by 1 AA battery (included). NightStick®, MT-110, Mini-TAC Light, Series: MT, LED Bulb, 90 Lumens, Long/Narrow Beam, 50000 hr Average Life, AA Battery, 1 Batteries, Black, 6061-T6 Aluminum Housing Material, IPX4 Enclosure