Like the original versions developed for combat pilots to aid in cockpit visibility on low-light night missions, these inexpensive, compact lights are a convenient way to illuminate a handlebar thermometer or reference a map during post-sunset navigation. An easy to use on/off switch can be operated with one hand to activate the white bulb that provides usable illumination without sacrificing night-vision. Elastic finger strap fits over most gloved fingers. Three replaceable AG10 button batteries (included). 1.75"×.5"×.5". 4 lumens. Black.