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13. ACCRUED WARRANTY (Tables)
6 Months Ended
Jun. 30, 2019
Less: Accumulated Amortization  
Warranty reserve activity
   

June 30, 2019

(Unaudited)

    December 31, 2018  
Beginning accrued warranty costs   $ 30,000     $ 5,000  
Provision for warranty expense     1,734       47,454  
Settlement of warranty claims     (1,734 )     (22,454 )
Ending accrued warranty costs   $ 30,000     $ 30,000