Effective treatment 、Low residual fluid 、 Low noise design 、DC Power 、Water quantity inspection 、 Food and materials Two Atomization Modes a) Mouthpiece atomization b) Mask atomization Innovative Mesh Technology Particle size is only 1-5μm, direct inhalation , 60% of particles are smaller than 2.5μm. Spray Absorbs Easily(Cold Technology Implemented)- Liquid temperature remain same , atomized hole about 1-3 μm One Clicked Operation Mode -Quiet and More Comfortable DC Power/ Battery Operation(Can switch according to your needs) -Small Size, Light & Portable Please Read Before Purchase: 1) This device will not able to work properly if usage with Purified Water, Filter Water, RO water. It only works with Pipe water/Mineral Water/Nebulizer Liquid Medicine. 2)Must Perform Fogging Cleaning after every usage with Liquid to Prevent Clogging - Long Press 3-4 seconds and the Light flashes twice to enter automatic cleaning mode 3) No Warranty on Liquid Cup 4) Please consult professional bodies on the usage. This set does not comes with any liquid. -N2 SET & N3 SET only different in appearance, and the functional parameters are the same. Both Using AA Battery/USB cable to function. -Rechargeable N3 Set build-in with 750mAh Rechargeable lithium-ion battery. Charging time : 5-8 hours, Usage time : Approx. 1hour