It also has a time period selection, in order to see how it behave between selected years.
The strategy behind it is simple :
We have an uptrend , (the psar is below our candles) we go long. We exit when our candle crosses the psar value.
The same applies for downtrend(the psar is above our candles), where we go short. We exit when our candle cross the psar value.
Among the basic indicators, it looks like PSAR is one of the best canditates for swing trading.
If you have any questions, please let me know.