I have had good luck with this company. I bought mine last year and cannot find 
the exact model online now....it runs off of 12v , 110v, d batteries and built in rechargeable nickel cadmium batteries. Two speed. Small and quiet.

http://www.amazon.com/Portable-Fan-Can-Batteries-Adapter/dp/B001APXO5C/ref=sr_1_8?ie=UTF8&qid=1401921819&sr=8-8&keywords=O2+cool+fan

   " keep on pushin'"
      Jeff Woodall 

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