Device
By default your conversions will registers for all devices. If you only want to target specific devices you can do this with a Device condition. Simply add the device(s) that you wish to include, and the others will be excluded. This is mostly used for Audience when you only want an experiment to run for specific devices. As the result page allows for breaking down the result on device you rarely need to set a device condition in a Goal.
Example
In the example above above the Add to cart goal will only register conversions for visitors who browse the website on desktop.
tip
Always test your Goals in Preview before activating the experiment to make sure that your goals triggers as expected.