The defaults are 12 and 26-periods for the EMAs, with the signal line as a 9-period EMA of the MACD line. To identify good entries and exits for higher timeframe trends. The reason I say higher timeframe is because we normally see more false signals on the lower timeframe as the result of choppier behavior. This is also why the MACD is not as effective in ranging environments. The MACD uses three exponential moving averages to show price momentum. This trading strategy is based on MACD crossover and crossunder. It uses the supertrend to identify the trend it is trading on and takes trades accordingly.