For use as a finger mounted LASER pointer. When using Gen III NVGs the pointer can be seen for a mile or more depending on ambient conditions. Mounts to either index finger. Has a momentary switch that lights LASER when pushed on. Uses 2 ea. A76 alkaline batteries or 2ea. LR44 batteries (included). Can also use 1ea. DL1/3N lithium battery. Includes: 1ea. FL-10, 2ea. FL5-B2