Power by upgraded rechargeable 300mAh battery which can last 1.5-5 hours, can from a regular outlet, computer, any other device via a USB port Quiet operated, the small fan rechargeable provide cool wind but never disturb you, which can be switches easily by press button This foldable fan can fit into almost any handbag and your pocket Can pull it anythere out when you outdoor Beating the heat wherever, whether work, home, traveling Our fan ensures you stay cooling This Foldable fan is powerful enough to generate strong wind You just need to press power button to change the 3 speed setting of the handheld fan