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14. ACCRUED WARRANTY (Details) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Accrued Warranty    
Beginning accrued warranty costs $ 30,000 $ 5,000
Provision for warranty expense 2,609 47,454
Settlement of warranty claims (2,609) (22,454)
Ending accrued warranty costs $ 30,000 $ 30,000