Quarterly report pursuant to Section 13 or 15(d)

BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES (Details-Product warranties)

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BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES (Details-Product warranties) - USD ($)
9 Months Ended 12 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Beginning balance $ 45,328 $ 58,791
Warranty claims incurred (14,548) (20,499)
Provision charged (credited) to expense (13,229) (7,036)
Provision charged (credited) to expense 13,229 7,036
Ending balance $ 17,551 $ 45,328