Mini usb fan With key switch 1. Altra silent,low noise 2. 220-240V Voltage,Power 20W 3. Pure metal Fan for long using Mini usb fan with key switch1.Convenient to use2.Good for gifts3.Good air cooling equipment4.With key switch5. Easy to installation,safe,Environmental protection6. 1 speeds control7. AS blade, Full metal construction8.Can be pair with any adapter(optional)