> For the complete documentation index, see [llms.txt](https://doc.customfit.ai/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://doc.customfit.ai/audience-segments/technology.md).

# Technology

Based on the visitor's browser's visitor agent CustomFit identifies various technical attributes:

* **Browser**
* **Device Type**
* **Operating System**
* **Screen Width**
* **Screen Height**

CustomFit.ai supports the following different operator types:

| Operator Type                 | Description                                    |
| ----------------------------- | ---------------------------------------------- |
| IS\_ONE\_OF, IS\_NOT\_ONE\_OF | Exact match                                    |
| IS\_SET, IS\_NOT\_SET         | Checks whether the attribute is set or not set |

To write a Technology-based rule

* Click on Add rule

![](/files/-MUqi4iJXISFD7cpnoPL)

* Click on the attribute field

![](/files/-Ma7lUYk-_JbNNNuySbv)

* In the dropdown, you can see the Technology section

![](/files/-Ma87R8UIBGCk937zZ3H)

* Select the required attribute
* Next, set the operator type based on your requirement

![](/files/-Ma87bJ7mAYPeFft0K1X)

* From the dropdown select the pre-filled values. And if there is no dropdown then enter the value

![](/files/-Ma87j55BYCJIT7atLVG)

* Then select which behavior needs to be served

![](/files/-Ma88-AtOLdsOr31i_Ls)

#### Rule with a single condition

For example, targeting visitors who are visiting from Desktop. So, the rule will be Device IS\_ONE\_OF Desktop.

![](/files/-Ma88bXyDwTKXtj_aeUg)

#### Rule with multiple conditions

For example, targeting visitors who are visiting from Desktop and the browser is Chrome. So, the rule will be Device IS\_ONE\_OF Desktop AND Browser IS\_ONE\_OF Chrome. 

![](/files/-Ma88pELLQ2dmXMl34xp)

#### Rule with multiple values

For example, targeting visitors who are visiting from Desktop and the browser is Chrome or Safari. So, the rule will be Device IS\_ONE\_OF Desktop AND Browser IS\_ONE\_OF Chrome OR Safari.

![](/files/-Ma89vEfhnc8U0Fq3ZAA)