NEGATIVE IONS PORTABLE COOLING FAN: Negative ion portable air conditioner fan can effectively activate oxygen molecules in the air, making them more active, more easily absorbed by the body, effective prevention of "air conditioning disease". PERSONAL AIR COOLER FAN: Add some water & ice cube in the water tank, portable air conditioner cooling fan makes ice water absorbs heat from the air and evaporates, causing the air temperature to drop, the fan blows out cooling wind to cool you down instantly. SUPER QUIET: Unlike regular air conditioner fan, the sound produced by this cooling fan will stay unnoticed, The whisper-quiet fan and soothing night light allows you to enjoy a comfortable night's sleep. PORTABLE & COMPACT DESIGN: Mini cooling fan is very easy to carry, perfect for home used and travel, the compact design fits nicely on your office desk, nightstand or coffee table etc. Sitting beside sofa or next to your kids, lovely pets.Our fan was not traditional air conditioner function, with ice cubes put in, cooling wind comes out, amazing! USER FRIENDLY: No battery required because it has a USB charging port design. fully charged can be used for 2.5-8 hours, Notice that the space cooler is small size for personal use, not a air conditioner, can't cool down a room.