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13. ACCRUED WARRANTY (Details) - USD ($)
6 Months Ended 12 Months Ended
Jun. 30, 2019
Dec. 31, 2018
Less: Accumulated Amortization    
Beginning accrued warranty costs $ 30,000 $ 5,000
Provision for product warranty costs 1,734 47,454
Settlement of warranty claims (1,734) (22,454)
Ending accrued warranty costs $ 30,000 $ 30,000