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Inventories
6 Months Ended
Jun. 30, 2011
Inventories
4.
Inventories

Inventories consist of the following:
 
   
June 30,
2011
   
December 31,
2010
 
             
Purchased components
  $ 155,503     $ 457,852  
Finished goods
    1,584,221       1,954,953  
    $ 1,739,724     $ 2,412,805