UVC Air Purifier Mist Heater & Fan is a 4-in-1 appliance that combines air purifier, mist humidifier, fan and heater in one body. In spring and summer, you can use it as a bladeless fan, improving indoor air circulation and purifying air with UVC sterilization at the same time. In colder and drier seasons of autumn and winter, it becomes a heater with PTC constant temperature heating technology and can humidify your indoor air at the same time, keeping your skin and nasal passage moisturized.