We do not currently offer the capability to limit by a particular audio device, only a device type.
In other words, 'Bluetooth' devices can be limited as a category, but not by an individual device name such as "John's Studio Headphones".
Our reasoning behind this decision is purposeful: John can rename his headphones to "John's New Studio Headphones" to bypass the limit. Or, John could just go out and buy a completely new pair of bluetooth headphones. For these reasons, we feel that limiting by category is the most structured. That being said, if you have a specific use case or problem you're trying to solve, please reach out to us! We'd love to hear from you and learn about your situation.