Klein Tools' Hard Hat Turbo Fan fits on the brim of most hard hats and safety helmets, and can also be used with the included dual-mount strap and mounting bracket for shells without a brim. The Hinged Adapter Bracket mounts directly to the accessory mounts on Klein Tools hard hats and safety helmets, as well as the Dual Mount Strap for hard hats without mounts. The fan is powered by Klein's Modular Battery (Cat. No. 29025). See battery instruction sheet for features and specifications.