Double Bollinger Bands

Directional - Trennd
Buyers break and close into upper band ( green area) for long entries with trend
Sellers break and close into lower band ( red area) for short entries with trend

Reversion to Mean
Sellers break and close out of upper band ( green area) for short entries against trend, Target (standard deviation One opposite side below centre line)
Buyers break and close out of lower band ( red area) for long entries against trend, Target (standard deviation One opposite side above centre line)