Portable: Take fresh air with you anywhere! The fan is lightweight and small enough to easily carry. Attach: Simply attach the fan to your face mask and breathe in the cool air! Safety and comfort in one. Voltage: 5V. Face Mask Fan: Get a wireless mini face mask fan. Modes: Two adjustable fan speeds. Size: 71.4mm x 33.5mm x 18.5mm. Wireless Mini Face Mask Fan | Black | Living Social