When price reaches above the upper red band, a sell position is opened. When price reaches the lower green band, buy position is opened. Trades can be managed with proper stop loss and take profit. In the picture, Firebird indicator is attached to daily chart of EUR/USD with 2% shift on MA. Note that almost all price bars are within the price bands. And when price extends beyond these bands, price trend reverses and comes back into the bands.
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