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14. ACCRUED WARRANTY (Tables)
3 Months Ended
Mar. 31, 2021
Less: Accumulated Amortization  
Warranty Reserve Activity
   

March 31, 2021

(Unaudited)

    December 31, 2020  
Beginning accrued warranty costs   $ 68,000     $ 30,000  
Provision for warranty expense     1,292       101,041  
Settlement of warranty claims     (1,292 )     (63,041 )
Ending accrued warranty costs   $ 68,000     $ 68,000