This technique is for those who want the most simple method that is almost fool-proof. It must be done only during the busiest trading hours, 3 am to 11 am EST. This method doesn't work in sideways markets, only in volatile trending markets.
Enter Long: when the red 3 has crossed up through the middle band at the same time, the AO should be approaching or crossing it's zero line, going up.
Enter Short: when the red 3 has crossed down through the middle band at the same time, the AO should be approaching or crossing it's zero line, going down.
In this strategy, both the entry and exit happen only during the london session.