The USB power supply air cooler ensures your daily use in office and home through the adapter or laptop, or your outdoor use through power bank when going outside, having a vacation or camping. The personal air cooler offers 3 speeds for your preference. Just select the perfect wind power as you need and the air conditional fan quickly cools down the temperature of your personal space. The most practical top water tank design gets you out of water leakage. You can add ice, ice water or essential oil into the tank to accelerate the cooling speed and to help keep your skin moist and enjoy the fresh air. Portable size makes the air conditional fan very easy and convenient to carry Runup 10 hours per Refill