Easy Activation: Simple head twist to activate with 90 lumens with machining for optimal grip. AAA Battery: Powered by a single widely available AAA battery. Incredible Performance: Features a high-performance Philips LUXEON TX LED and a PMMA TIR lens that focuses the light to reach out up to 44 meters. Mini Size: As small as your pinky finger, weighing only 0.68 oz and measuring just 2.38 in. * i3E EOS Osight Edition and Dream Blue and Stars & Stripes Edition are sold out!