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4. Property and Equipment
 12 Months Ended
Dec. 31, 2016
Property, Plant and Equipment [Abstract]  
Property and Equipment

At December 31, 2016 and 2015, property and equipment consists of the following:

 

   December 31, 
   2016   2015 
         
Office equipment  $28,000   $65,000 
Furniture and fixtures   3,000    4,000 
Testing equipment   18,000    13,000 
Subtotal   49,000    82,000 
Less accumulated depreciation   (32,000)   (60,000)
Total  $17,000   $22,000 

 

During the year ended December 31, 2016, the Company disposed of certain property and equipment with aggregate costs of $38,000 and accumulated depreciation of $35,000 which resulted in a loss of $3,000. Depreciation expense for the years ended December 31, 2016 and 2015 was $7,000 and $12,000, respectively.