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WARRANTS (Tables) | 12 Months Ended
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Dec. 31, 2020
Warrants |
Schedule of common stock warrants outstanding | The following table summarizes information about common stock warrants outstanding at December 31, 2020:
Outstanding |  |  | Exercisable
|  |  |  |  | Weighted |  |  |  |  |  |  |  |  |
|  |  |  |  | Average |  |  | Weighted |  |  |  |  |  | Weighted
|  |  |  |  | Remaining |  |  | Average |  |  |  |  |  | Average
Exercise |  | Number |  |  | Contractual |  |  | Exercise |  |  | Number |  |  | Exercise
Price |  | Outstanding |  |  | Life (Years) |  |  | Price |  |  | Exercisable |  |  | Price
$— |  |  | 6,500 |  |  |  | 3.25 |  |  | $ | — |  |  |  | 6,500 |  |  | $—
$0.88 - $1.91 |  |  | 3,237,016 |  |  |  | 4.30 |  |  | $ | 1.43 |  |  |  | 3,237,016 |  |  | $0.88 - $1.91
$8.00 - $19.80 |  |  | 53,452 |  |  |  | 3.37 |  |  | $ | 12.74 |  |  |  | 53,452 |  |  | $8.00 - $19.80
$440 - $920 |  |  | 16,225 |  |  |  | 2.19 |  |  | $ | 733.40 |  |  |  | 16,225 |  |  | $440 - $920
$1,040 - $2,000 |  |  | 2,367 |  |  |  | 2.18 |  |  | $ | 1,404.85 |  |  |  | 2,367 |  |  | $1,040 - $2,000
$0.88 - $2,000 |  |  | 3,315,560 |  |  |  | 4.27 |  |  | $ | 6.19 |  |  |  | 3,315,560 |  |  | $6.19
Schedule of option pricing | The Company utilized the Black-Scholes option pricing model and the assumptions used during the years ended December 31, 2020 and 2019:
|  | Year Ended |
|  | December 31, 2020 |  |  | December 31, 2019 |
Weighted average risk free interest rate |  |  | 0.12% — 1.38% |  |  |  | 1.75% — 2.28% |
Weighted average life (in years) |  |  | 1.42 — 5 |  |  |  | 5.0 |
Volatility |  |  | 86.3% — 104.6 |  |  |  | 85.5% —87.5% |
Expected dividend yield |  |  | 0 | % |  |  | 0 | %
Weighted average grant-date fair value per share of warrants granted |  | $ | 1.21 |  |  | $ | 10.34

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