As you can see the price is moving below the SMA and within the Lower band indicate a time for buy and exit when the price move back toward the SMA but investor cant just enter when the price moving below the lower band as it could be false indicator so looking at the ROC that is -18.60 indicate that a sell signal as when ROC crosses below 0, it’s often considered a sell signal and implies selling pressure which results in a decrease in price. the slope of the band also is slipping down indicate that the price is going down. here we can conclude that investor should enter as short selling as the price is predicted to decrease in the near future