Harris Wasp & Hornet Killer has a powerful spray that reaches up to 20 feet above ground level to penetrate deep into nests and kill wasps and hornets on contact. The spray is also effective for yellow jackets, fire ants, scorpions, crickets, flies and more. The spray can be used indoors and outdoors. Electrically Non-Conductive.Harris wasp & hornet killer is electrically, non-conductive and has a dielectric breakdown voltage of 47, 300 Volts making it safe to spray around electricity without being shocked. The 20 foot jet blast will reach nests 20 feet above ground level.