Just pour water into the container and use no electricity to use this natural evaporative eco humidifier (collaborate with Disney). Use the dedicated aromatic water in the office, living room, travel, bedroom, etc., to enjoy the scent and relax and deodorizing (ammonia, acetate) effects. Antibacterial and mildew resistant filter Humidification rate (= natural evaporation) is more than 5 times the amount of natural evaporation per cup! Compare to 1 cup (2.0 in) (52 mm) at room temperature of 7.9 °F (25 °C) and humidity of 25 %. Filter replacement is estimated for one season (3 to 6 months). Replacement filter fits U50E-13 (Mickey & Minnie) Oasis Plus Disney Character Version Replacement Filter U50E-06 (Natural) U50E-07 (Green) U50E-08 (Pink)