Overview: 1. Adjustable wind speed, three wind speed modes, which can be freely switched through the power button. 2. Also power bank: The power bank comes with a dual-line power bank that can charge three devices simultaneously. 3. USB power supply, compatible with computers, laptops, portable chargers, and other devices with USB output. 4. Mini design, easy to carry, can be carried anywhere, can be put into your bag. Perfect mini fan for office, home, dormitory, study, library, game room, or outdoor. Product information : Power supply mode: