Opens a long position if the PB line (the red line in the oscillator) crossover the low of the band, the zero line or the top of the band. If the PB line makes a crossunder in the top of the band, the zero line or the bottom of the band it closes the long position and immediately opens a short position.
Also, the PB value must be higher than 5 candles before if it is a long position and PB must be lower than 5 candles before to open a short position
I got the BandPass Script from tradingview.com/u/everget/ and made some changes in the configs to adapt the strategy.