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4. Property and Equipment (Tables)
9 Months Ended
Sep. 30, 2016
Property, Plant and Equipment [Abstract]  
Property and equipment
   September 30, 2016   December 31, 2015 
    (unaudited)      
Office equipment  $28,040   $65,051 
Furniture and fixtures   2,880    4,075 
Testing equipment   18,197    12,914 
Subtotal   49,117    82,040 
Less accumulated depreciation   (30,627)   (60,242)
Total  $18,490   $21,798