Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies (Details 2)

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Summary of Significant Accounting Policies (Details 2) - USD ($)
9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Accounting Policies [Abstract]    
Balance at beginning of year $ 24,190 $ 21,935
Increase in estimated warranty liability 4,650 4,478
Warranty expenses incurred (1,837) (5,047)
Balance at end of year $ 27,003 $ 21,366