The Volas Portable USB Rechargeable Bladeless Mini Fan is USB rechargeable. Connect a USB power source and charge it before work, sleep or travel if you do not know the runtime.
The listing does not give voltage, milliamp-hours or a full-in-X-minutes claim. It also does not say whether the fan can run while charging.
Return to the Volas mini fan product page to pick White, Green or Pink.