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Mr. Bollinger notes the following characteristics of Bollinger Bands:

- Sharp price changes tend to occur after the bands tighten, after volatility lessens.

- When prices move outside the bands, a continuation of the current trend is implied. Bottoms and tops made outside the bands followed by bottoms and tops made inside the bands call for reversals in the trend.

- A move that originates at one band tends to go all the way to the other band. This observation is useful when projecting price targets.

- Bollinger Bands are displayed in two bands which are plotted at standard deviation levels above or below a moving average.

- Bollinger Bands provide a view of the current trading range. They can be used with other indicators to determine when it's time to buy or sell.