3. ACCOUNTS RECEIVABLE, AND DEFERRED REVENUE

12 Months Ended

Dec. 31, 2020

Receivables [Abstract]

ACCOUNTS RECEIVABLE, AND DEFERRED REVENUE

3. ACCOUNTS RECEIVABLE AND DEFERRED REVENUE

Accounts Receivable

The Company records accounts receivable as it bills its customers for products and services. The allowance for doubtful accounts is based upon the Company’s policy (See Note 1). The bad debt expense was $0 and $2,429 for the years ended December 31, 2020 and 2019, respectively.

Deferred Revenue

Deferred revenues are deposits from customers for product sales which have not yet been delivered and multi period maintenance contracts (See Note 1 and 17). Deferred revenue was $107,489 and $93,609 at December 31, 2020 and December 31, 2019, respectively.