The Halo Light Personal Active Safety System - Rechargeable Hard Hat Light 360-degree Personal Active Safety System that attaches to any standard hard hat LED safety and task light with four light modes (Halo, HI-Alert, Task, and Dim) Visible up to a quarter mile away, produces up to 276 lumens of power Rechargeable Lithium-Ion battery lasts at least 12 hours on a single charge Built to survive in rough construction environments