Keltner Channel is a well known indicator that not in MT4's indicators default lineup (You can get this from your broker somehow). This indicator helps you to define trend and sometimes overbought/oversold prices during flat trend.

Input Description:

• EMAperiod: Moving Average period used for indicator. Must be higher than 1.
• ATRperiod: Average True Range period used for indicator. Must be higher than 1.
• multiplier: Multiplier used for determine channel's wide. Must be higher than 0 but may not be integer.
• shift: Give an additional shift to the channel.