There is no liquid in this item when mailed/packaged/sent. LIQUID FREE. Sleek Rainbow filtration unit. Black top with water container. Modern and efficient. The Rainbow RainMate is a device that functions as an air freshener, odor neutralizer, and humidifier. It's designed to sit on a desk, countertop, or nightstand and utilizes fresh water to circulate gently scented air into your home environment. Here's how it generally works: Water Filtration: The device draws air from the room into a swirling water bath, where dust and odors are intended to be trapped. Aromatizing/Deodorizing: You can add specific Rainbow fragrances or essential oils to the water to infuse the air with pleasant scents.