Double (switchable) Essential Oil Waterless Nebulizer- USB to CThis product is suitable for 10 ml bottled essential oils. Double Essential Oil Waterless Nebulizer doesn't need water or heat. It directly atomizes the essential oil into 1 3 nanometre particles, which will not destroy its molecular structure and make the essential oil more fragrant. How to use: For the first use, gently push the button at the bottom with your fingers. Remove the empty bottle and replace it with new bottle of essential oil, then put