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3. ACCOUNTS RECEIVABLE, AND DEFERRED REVENUE | 12 Months Ended
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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.

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- Definition The entire disclosure for claims held for amounts due a entity, excluding financing receivables. Examples include, but are not limited to, trade accounts receivables, notes receivables, loans receivables. Includes disclosure for allowance for credit losses. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -URI http://asc.fasb.org/subtopic&trid=2196772 + Details
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