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14. ACCRUED WARRANTY (Details) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Less: Accumulated Amortization    
Beginning accrued warranty costs $ 30,000 $ 30,000
Provision for product warranty costs 31,864 2,609
Settlement of warranty claims (1,864) (2,609)
Ending accrued warranty costs $ 60,000 $ 30,000