The Stochastic Oscillator chart is drawn in a separate window under the price chart and consists of two lines: %K, the quick one, and %D, the slow one. The values vary from 0% to 100%; at the levels of 20% and 80% signal lines, defining the oversold (0-20%) and overbought (80-100%) areas, are drawn.
In the description of the indicator in the book "Bollinger on Bollinger Bands", it is said that the price remains at the borders of the lines 95% of the time and escapes those borders in 5 remaining percent. If volatility on the market is low, the upper and the lower lines are close to one the other, while the price is trading between them; the higher the volatility, the wider the channel formed by the three lines (pic 1). According to the classification, the Bollinger Bands are a trend indicator as it shows both flats and directed price movements. The timeframe may be anything from M1 to a year.
The Relative Strength Index (RSI) is one of the few trader's instruments able to go ahead of the price. Of course, such situations do not happen every day, however, this feature is really interesting and useful for the analysis of the current market situation.