Rechargeable Mask Mini FanThree-speed adjustable wind power, quad-core wind power, high strength suction,accelerates the exhaust of breathing exhaust gas and moisture, and keeps fresh air flowing through your mouth suitable for long time use. Low Noise OperationIt can be charged via a usb cable. This built-in lithium battery air circulating fan is energy-saving and environmentally friendly. High efficiency and low noise operation. Easy ChargingPowered by Type-c rechargeable large capacity lithium battery. You can use it up to 4 hours of non-stop cooling from a single charge. Compatible to multiple charging methods: power bank, adapter, computer. Making sure you breathe fresh air wherever you go. Convenient to CarryThe weight of the mini fan is only 30grams, Suitable for All Kinds of MaskIt can easily attach to your mask. Clip it on and off on any mask types such as surgical medical masks, sewn or fabric masks and many more. It can be placed in the office, living room and bedroom. Suitable for Valentine's Day gifts, birthday gifts, Christmas gifts and Halloween gifts.