Versatility. That is what you think of when you consider the Gerber Axle 2x3 headlamp model 22-80141. Attach it to a pocket. Attach it to a cap. Wear it as a head lamp. All three choices leave your hands free to work. Easily change from 40 lumens of bright white light to 6.9 lumens of red light without changing out parts. The purpose of the red light is to conserve your night vision. The lamp is tilted 30 degress to reduce neck fatigue. Additional features include a 90 degree pivoting head and water resistant construction. Runs on three AAA batteries.