BS EN IEC 62680-1-7:2019 Universal serial bus interfaces for data and power Common components. USB Audio 3.0 device class definition data formats

Multimedia
Battery-powered devices
Electrical properties and phenomena
Identification methods
Voltage
Audio equipment
Dimensions
Electronic equipment and components
Portable
Electric plugs
Battery chargers
Electric charge
Electric connectors

Link: BS EN IEC 62680-1-7:2019 Universal serial bus interfaces for data and power Common components. USB Audio 3.0 device class definition data formats
Source: BSI Standards