Bollinger Bands

 

A tool used by technical analysts. A band plotted two standard deviations on either side of a simple moving average, which often indicates support and resistance levels.

 
VolkovYuriy:
A tool used by technical analysts. A band plotted two standard deviations on either side of a simple moving average, which often indicates support and resistance levels.

Usually, Bollinger bands are recommended to be used only as reference points of movement of the price for arrangement of take-profits, they are seldomly used as a signal for an input in a line item.

Anyway, before the use of bands of Bollinger, it's recommend to evaluate a market phase by means of other indicators, doing this would bring better result.