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6. Inventory, net (Tables)
3 Months Ended
Mar. 31, 2020
Inventory Disclosure [Abstract]  
Schedule of Inventory
   March 31,
2020
   December 31,
2019
 
Parts  $53,820   $31,458 
Finished goods   94,964    102,889 
Total   148,784    134,347 
Less inventory reserve   (71,603)   (71,414)
Inventory, net  $77,181   $62,933