Micro minature LED light. Parabolic shaped LED optimizes beam performance. Features a 5mm White LED delivers up to 10 lumens. Has a 100,000 hour lifetime so it will never need replaced. Run time of up to 8 hours of declining usable output. Includes four IEC-LR41 coin cells. Rotating On/Off head switch Constructed of machined aircraft aluminum. Nano Light is just 1.47 inches Non-rotating snap hook for easy one-handed operation. Impervious to shock