The Halo was specifically designed for people working in tough environments. Powerful flood task lighting to the visual periphery for improved work efficiency.  Rechargeable battery provides 5 ½ to 34 hours of runtime depending on modes used. Four light modes: halo, hi-alert, task, and dim. Full brightness in 360º to enable the wearer to see and be seen in all directions.  Connects securely to any standard hard hat.