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13. ACCRUED WARRANTY (Tables)
3 Months Ended
Mar. 31, 2019
Accrued Warranty Tables Abstract  
Warranty reserve activity
   

March 31,

2019

(Unaudited)

   

December 31,

2018

 
Beginning accrued warranty costs   $ 30,000     $ 5,000  
Provision for warranty expense     1,324       47,454  
Settlement of warranty claims     (1,324 )     (22,454 )
Ending accrued warranty costs   $ 30,000     $ 30,000