Review on O2COOL 10-Inch Battery Operated Fan - Portable with Rechargeable Battery, Multiple Power Options - AC/DC Adapter, USB Port for Emergencies, Camping, Travel, Indoor & Outdoor Use (Orange) by Ronald Lunn

I have been using O2COOL fans for more than 10 years, they are very reliable and durable, and every additional attachment on new models is definitely an improvement. Excellent instrument, wide range of power sources, features: internal rechargeable battery, uses alkaline (D) batteries and external power supply. An LED power indicator shows what mode the device is in, and a detachable base bracket makes it easy to adapt to different surfaces.