Keep cooler in hot job site conditions with the 18V LXT Cordless High Visibility Fan Jacket. The 18V LXT Cordless High Visibility Fan Jacket utilizes the same 18V lithium-ion slide-style batteries that work in your power tools. Fan units provide air circulation inside the jacket for up to 11.25 hours of run time on the high setting when using a 5.0Ah LXT battery (BL1850, sold separately).