# @ohos.app.ability.contextConstantThe **ContextConstant** module defines data encryption levels.> **NOTE**> > The initial APIs of this module are supported since API version 9. Newly added APIs will be marked with a superscript to indicate their earliest API version.> The APIs of this module can be used only in the stage model.## Modules to Import```tsimportcontextConstantfrom'@ohos.app.ability.contextConstant';```## ContextConstant.AreaModeYou can obtain the value of this constant by calling the **ContextConstant.AreaMode** API.**System capability**: SystemCapability.Ability.AbilityRuntime.Core| Name| Value| Description| | -------- | -------- | -------- || EL1 | 0 | Device-level encryption area.| | EL2 | 1 | User credential encryption area.|