This is a very simple script that plots signals on the chart whenever the RSI crosses the given threshold. Nothing fancy, but it is useful for deciding when to exit trades or prepare for pullbacks or for confirming that the market is currently in the middle of an extremely impulsive move or trend. It has alert functionality and you can set the overbought/sold thresholds and RSI length in the options menu.
Note: I definitely wouldn't recommend using it to enter trades unless you're an experienced counter-trend trader :)
Regards -
Matt.