Mini and portable Considerate and user-friendly Long battery life Noiseless operation 3 Speed Settings Apple Cable Output Line Built-in 4000mAh Power Bank Compact and Space-saving Powerful Turbine Fan Blades Noiseless Operation Quietly Comfortable Can be use as a power bank. HELP YOUR HOT FLASHES : This hand held fan comes with brand new copper made motor, is able to generate up to 4300 RPM in the maximum speed, which is powerful enough that can support the blade running at very high speed . KEEP YOU ALWAYS SAFE : The battery life and safe is what customer worried and concerned, with our newly designed batteries, it uses over electric current protection and low voltage protection to avoid overcharge and over discharge, which helps to offer thousands of charging times of battery for customer. YunTuo are trying our best to contribute to a more sustainably powered product. Mini fan comes with the usb cable that compatible with any USB port, such as computer, power bank, regular socket.