Air cooler: Get an air cooler and humidifier. Purpose: Cool the air or decrease the humidity in your home with this smart machine! Water tank: Boasts a water tank capacity of four litres. Three speeds: Features three different air cooling speeds which can be adjusted to suit your needs.. Options: Choose between a black air cooler without a remote or a white air cooler with a remote. 4L Portable Air Cooler Fan | Black | Living Social