The indicator involves plotting two bands above and below the moving average. The indicator is based on principles similar to those "envelopes" and Bollinger bands; The difference is that instead of percentages ("envelope") or standard deviations (Bollinger) are used the average true range. The upper band is calculated as the moving average is taken, plus several times the average true range. The lower band - minus the moving average taken several times the average true range. As a rule, the upper bar indicates "overbought" market and a greater likelihood downward correction. The lower band is "oversold" market and indicates a high probability of correction upward. For example, we can open a long position when the current closing price is lower than the 4-day exponential moving average of the previous day minus 77% of the value of a 4-day true range of the previous day. Close long positions and open a short can be when the current close is greater than the value of the 4-day EMA of the previous day plus 77% of the value of the 4-day average range of the previous day. To filter unprofitable transactions and improve the results can be added to a variety of long-term filters that allow the system to operate only in the direction of the main trend.