This?Mini Handy Fan?is?ideal for indoor and outdoor using, such as beside your bed, computer, table, desk, sofa, car, picnic, hiking, Camping and etc. Dual power source, plug in with the USB adapter or use with the battery, so convenient! Two shift speed level to control.The 4 Inch Mini Rechargeable Fan is your perfect carry-around for extremely hot days, or for use in crowded areas. The mini-sized fan fits into your palm so you can hold it or place on your table for more convenience. This rechargeable handheld fan can be converted to desktop mini hand fan when folded. It can be used up to 3 hours operating time. This Rechargeable Mini Handy Fan comes with 2 Fan speed. The button on the right side has to be pushed up once for the first level of speed, and pushed up a second time for the second level of speed? Charging time is between 4-6hours. Charge 8hours before first use.