Zep Enforcer Wasp & Hornet Killer features an instant knockdown formula that kills wasps, hornets, and yellow jackets on contact, including the entire nest. Its powerful jet blast reaches up to 22 feet, allowing you to spray safely from a distance, and the non-conductive formula is safe up to 47,300 volts. The residual action continues to kill returning insects, providing lasting protection. Designed for outdoor use only, it works best when applied in the early morning or late evening while the insects are at rest.