Item: B41-1518 
What is "Smart Power"?
Simply Put: It Maximizes The Battery Life. The fan will automatically choose the least expensive and most efficient power source. With Smart-Power, you'll have over 72 hours of cooling when the power is out!
This 02 Cool Smart Power Rechargeable Fan is the newest fan to hit the market. It offers new 180 degree swivel fan blade cage, variable power switch, and rechargeable energy efficient "Smart Power" electronic circuitry. It can be powered in four different ways.
Charges Over 500 Times Pivoting fan cage and handle hanger allows for directing the air flow for the most effective cooling
"Five Star Rating"
Rayovac Alkaline Batteries(A $14.95 Value)
Optional:Non Rechargeable Fan Listed Below
Rechargeable Fans and the Environment - when batteries are improperly disposed of in household and workplace waste, they can leak toxic heavy metals into the environment. 73 percent of municipal solid waste is either land filled or incinerated. When these batteries are land filled, they can leach heavy metals slowly into the soil and ground and surface water. When batteries are incinerated, certain metals may be released into the air or concentrated in the ash that has to be disposed of. About Rechargeable Fan Batteries.
Heavy metals from batteries can make it into the food chain where they pose health impacts on humans. Mercury was phased out of certain batteries starting in 1996 with the signing of the Battery Act, but other heavy metals such as Cadmium are still used, which are very toxic. Recycling of batteries through the proper collection and disposal at a municipal collection location will greatly reduce their impact on the environment. Using rechargeable batteries reduces the manufacturing levels of heavy metals and greatly reduces disposal requirements.
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Best Battery Operated Fans Review 2013
Cost Savings - rechargeable batteries can be used over and over and each new charge prevents the purchase of a new battery, Today's rechargeable batteries have high capacities and are a better choice to provide portable power to electronic devices. Improvements are made consistently to rechargeable battery technology increasing their capacity .
Also See: (Tent Air Conditioner Fan)