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Inventories
12 Months Ended
Dec. 31, 2019
Inventory Disclosure [Abstract]  
Inventories

7. INVENTORIES

 

As of December 31, 2019 and 2018, inventories consist of:

 

    December 31, 2019     December 31, 2018  
Raw materials   $ 3,437     $ 3,482  
Finished goods     453,634       628,439  
Cost of projects     49,233       152,131  
    $ 506,304     $ 784,052  
Allowance for slow-moving or obsolete inventories     (203,366 )     (90,375 )
Inventories, net   $ 302,938     $ 693,677  

 

For the year ended December 31, 2019, 2018, and 2017, impairments expense for obsolete inventories were approximately $115,000, $30,000 and $177,000, respectively.