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. To kill wasps, hornets, yellow jackets, and bees under eaves, screens, window frames, doors, patios, cracks, holes or crevices whenever insects are noticed, spray for about 1-2 seconds or until surface is moist. Do not spray the treated area to the point of runoff. To prevent entrance of insects into the house, spray around points where insects enter such as plumbing, faucets, etc. and crack and crevices of foundation. Do not spray vegetation directly to prevent damage to the foliage. Size 16 ozs.