Key assumptions used by the Company are summarized as follows at the original grant date and the date of revision:
| Modification | Original | |||||||
| Stock price | $ | 0.25 | $ | 0.00275 | ||||
| Exercise price | $ | 0.05 | $ | 3.00 | ||||
| Expected volatility | 86 | % | 105 | % | ||||
| Expected dividend yield | 0.00 | % | 0.00 | % | ||||
| Risk-free rate over the estimated expected life of the warrants | 0.27 | % | 0.84 | % | ||||
| Expected term (in years) | 1.92 | 3 | ||||||