... as air circulator and humidifier 3)Powered by USB or battery Mini Fan USB Handheld Air Aircon Features: ... into the cooler body, insert batteries or connect USB port, and it begins to work.2. Working ... need the cooling function).3. Power supply choices: 4 x AA batteries, USB port, and power adapter ... Black+WhitePowered by: 4 x AA batteries, through USB port, or via power adapter (batteries and adapters ...