The Milwaukee Tool USB Rechargeable Low-Profile Headlamp, No. 2115-21, features a thin 1” light head and delivers wide flood beam coverage and 600 lm of Trueview high definition output. With the battery pack positioned in the rear, the headlamp offers maneuverability in tight spaces and a balanced design for all-day use. The headlamp offers four output modes: high, medium, low, and eco. It has a run-time of two hours on high (600 lm), six hours on medium (350 lm), 10.5 hours on low (125 lm), and 25 hours on eco (25 lm). The headlamp also features a sweat-absorbing microfiber strap for comfort and optional hard hat clips.