The Nightstick MT-100 series non-rechargeable metal flashlights each use a CREE® LED in combination with a deep parabolic reflector creating a tight, long throw beam for distance illumination. With a water resistant design, each light is constructed from aircraft-grade 6061-T6 aluminum with a Type 2 hard anodized finish. The tail switch on each light provides momentary or constant-on functionality. The MT-100, 110 and 120 each come with a removable pocket clip, while the MT-130, with its goose-neck design, comes with a removable clip-on magnet...perfect for a multitude of hands-free uses. The MT-110, 120 and 130 also include a removable wrist lanyard. The MT-100 is powered by two AAA batteries. The MT-110 uses a single AA battery The MT-120 and MT-130 use two AA batteries. In all cases, the batteries are included. More information can be found at www.mynightstick.com.