USB class 0x03 — Human Interface Device
Class code 0x03 marks a device or interface as Human Interface Device. Operating systems read this value from the descriptor and bind a generic class driver, which is why most human interface device hardware works without a vendor driver even when the VID:PID pair is unrecognised.
How it appears on your system
$ lsusb -v
bInterfaceClass 3 Human Interface DeviceWindows exposes the same value in the compatible IDs list as USB\Class_03, extended with &SubClass_xx&Prot_xx for the subclass and protocol below.
Subclass and protocol codes
| Subclass | Protocol | Meaning |
|---|---|---|
| 00 | — | No Subclass |
| 00 | 00 | None |
| 00 | 01 | Keyboard |
| 00 | 02 | Mouse |
| 01 | — | Boot Interface Subclass |
| 01 | 00 | None |
| 01 | 01 | Keyboard |
| 01 | 02 | Mouse |
Looking up a specific device instead? Search by VID:PID or browse the vendor directory.