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# Keltner Channel

## Description

Keltner Channel indicator is based on volatility using a pair of values placed as an "envelope" around the data field.

## Syntax

`KeltnerChannel(double offsetMultiplier, int period)`

`KeltnerChannel(ISeries\<double\> input, double offsetMultiplier, int period)`

**Returns midline value**

`KeltnerChannel(double offsetMultiplier, int period)[int barsAgo]`

`KeltnerChannel(ISeries\<double\> input, double offsetMultiplier, int period)[int barsAgo]`

**Returns upper band value**

`KeltnerChannel(double offsetMultiplier, int period).Upper[int barsAgo]`

`KeltnerChannel(ISeries\<double\> input, double offsetMultiplier, int period).Upper[int barsAgo]`

**Returns lower band value**

`KeltnerChannel(double offsetMultiplier, int period).Lower[int barsAgo]`

`KeltnerChannel(ISeries\<double\> input, double offsetMultiplier, int period).Lower[int barsAgo]`

## Return Value

**double;** Accessing this method via an index value `[int barsAgo]` returns the indicator value of the referenced bar.

## Parameters

| Parameter | Description                                                                                     |
| --------- | ----------------------------------------------------------------------------------------------- |
| input     | Indicator source data ([Series\<T>](/developer/desktop-sdk/references/common/iseriest/seriest)) |
| period    | Number of bars used in the calculation                                                          |

## Examples

```csharp
// Prints the current upper value of a 20 period KeltnerChannel using default price type
double value = KeltnerChannel(1.5, 20).Upper[0];
Print("The current KeltnerChannel upper value is " + value.ToString());

// Prints the current lower value of a 20 period KeltnerChannel using high price type
double value = KeltnerChannel(High, 1.5, 20).Lower[0];
Print("The current KeltnerChannel lower value is " + value.ToString());
```

## Source Code

You can view this indicator method source code by selecting the menu New > NinjaScript Editor > Indicators within the NinjaTrader Control Center window.