As others have indicated Device licenses are designed for use on a handheld or 'shop floor' PC. I understand they allow users to preform any actions they would as if it was a Premium or Essential licensed environment (you cant mix Premium and Essenial in the same envirionment).
Setting your envrionment to use deviced liceses requires the use of Intune, creating a specific security group and assiging all the users and the devicve licenses to that securty group. The exact name of the sceurty group is : Dynamics 365 Business Central Device Users
The device license applies to certain specific scenarios and its associated functionality I recommend you check the licensing guide where the different uses and functionality are collected .
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