Scent Crushers Wind Grenade discharges a scentless vapor for visual representation of the wind direction. Using E-Vapor technology, the replaceable vapor stick lasts up to 300 uses. Fits comfortably in your hand or pocket. Comes with a lanyard and lanyard clip for easy carry and quick access. Cancer and Reproductive Harm- www.P65Warnings.ca.gov. Type: Wind Detectors.