OR-DP3 Electric ULV sprayer uses heavy and high-speed motor that produces convolute and high-speed airflow, which pressurizes chemical liquid into nozzle. Due to common effect of the high-speed airflow and well-connected nozzle, the chemical liquid is broken into extremely small fog particles of only about 20 micron. For its equality and dispersion, these particles can float over the open air longer time, thus ensuring its effect of killing pests and air disinfection efficiently.