1.ABS material is environmental, safe and durable. Low voltage is power-saving and safe to use. 2.Mute fan provides a nearly silent sleeping environment to ensure you can sleep well. 3.Powerful airflow of fan can make vortex to kill mosquitoes safely and easily by air drying and dehydration. 4.Safety and hygiene: without any chemicals, non-toxic, tasteless, no radiation, safety and environmental protection