FAST COOLING & 3 SPEEDS: Comply with the refrigerator with some ice or frozen water, turn on this portable air cooler and it will dissolve the cold within seconds. The personal air cooler has 3 fan speeds, so you can adjust the wind power to meet your needs. Quiet operation: Although the fan is very strong, even at high speed the noise is less than 50dB. It is a quiet and good friend when working and sleeping. Ideal for your desk, office room Use. Portable USB Port Air Cooler: Powered by USB cable, compatible with computers, laptops, power banks, wall chargers and any other USB-enabled power supply. USB fan is energy-saving and environmentally friendly. Portable and light weight design, when you go out, you can put it in the bag with you, especially suitable for summer trips or outdoor sports, which will not take up much space and can easily take to anywhere. You can enjoy the coolness in offices, living rooms, kitchens, studios, etc. Eco-friendly and energy-saving. It does not contain harmful refrigerant, does not use freon, nor does it use a compressor as a conventional energy-consuming air conditioner. Our air cooler has low power consumption to decrease your electricity bill and is fully suitable for our low carbon lifestyle.