Power by upgraded rechargeable 600mAh battery, you can charging from a regular outlet, computer, any other device for USB port This portable fan is powerful enough to generate wind You just need to press power button to change 3 speed setting of the handheld fan This fan fit into almost any handbag and your pocket You can pull anythere out when you outdoor Beating heat wherever, whether work, traveling Our fan ensures you stay cooling Quiet operated, the small fan rechargeable provide cooling wind but never disturb you, which can be switches easily by press button