1.Easy to use and clean,prevent bacteria 2.USB port and can use the transformer or battery pack 3.Fashional touch switch Mini USB Doughnut Mist ProjectorModel: SS01721.USB port and can use the USB transformer or battery pack2.Powered by DC 5V/500mA3.Touch Switch4.Easy to clean, prevent bacteria5.Can be used as aroma diffuser Mini USB Doughnut Mist Projector