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Inventories (Tables)
12 Months Ended
Dec. 31, 2020
Inventory Disclosure [Abstract]  
Schedule of Inventories

As of December 31, 2020 and 2019, inventories consist of:

 

    December 31, 2020     December 31, 2019  
Raw materials   $ 3,663     $ 3,437  
Finished goods     427,942       453,634  
Cost of projects     34,792       49,233  
    $ 466,397     $ 506,304  
Allowance for slow-moving or obsolete inventories     (211,719 )     (203,366 )
Inventories, net   $ 254,678     $ 302,938