Bollinger bands

Buy Opportunity: Price crosses and closes above the upper band.

Sell Opportunity: Price crosses and closes below the lower band.

Filter value: No effect. No value to add.

BOLLINGER BANDS REVERSE

Buy opportunity: The price crosses below the lower band and then re-enters on the close of the next candle.
Sell opportunity: The price crosses above the upper band and then re-enters on the close of the next candle.
Filter value: No effect. No value to add.