A tank of 420 ml water can continuously spray cooling mist for 4-6 Hours. Suitable for use at every age for all ages, a portable air conditioner is an easy way to cool them down while working hard. Low Energy Consumption This evaporative air cooler is Freon-free air conditioning which could operate at low energy consumption. If your home alone, using this fan is perfect, cool, and energy-efficient. The humidification function can automatically turn off when the tank lacks water. A portable air conditioner fan can be used as an ordinary fan, or as an air cooler fan. Built-In battery led light with 12 Months Included in box 1 x Air Conditioner Fan, 1x DC Adapter,1 X User Manual in English 1 Air conditioner Fan, 2 USB Cable, 3 Water Injection Bottle.