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12. REVENUES | 6 Months Ended
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Jun. 30, 2018
Notes to Financial Statements |
REVENUES | For each of the identified periods, revenues can be categorized into the following:
|  | For the six months ended June 30, |
|  | 2018 |  |  | 2017 |
Product Sales |  | $ | 3,706,103 |  |  | $ | 874,819 |
Maintenance Fees |  |  | 3,789 |  |  |  | – |
Professional Services |  |  | 10,575 |  |  |  | 3,600 |
Total Revenues |  | $ | 3,720,467 |  |  | $ | 878,419 |
At June 30, 2018 and December 31, 2017, deferred revenue amounted to $70,724 and $77,514 respectively. At June 30, 2018, the Company has received an initial deposit to plan and manufacture two Solar Tree® units in addition to deposits for multi-year maintenance plans for previously sold products. As of June 30, 2018, deferred revenue associated with product deposits are $26,304 and the delivery of such products are expected within the following six months, while deferred maintenance fees amounted to $44,420 and pertain to services to be provided through the second quarter of 2022.

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