55aa:b004 — OnSpec MMC/SD Reader/Writer
OnSpec Electronic, Inc.
- Vendor ID
- 55aa
- Product ID
- b004
- Combined
- 55aa:b004
- Decimal
- 21930:45060
What is this device?
This is the USB identifier for a OnSpec MMC/SD Reader/Writer manufactured by OnSpec Electronic, Inc.. The vendor ID 55aa is registered to OnSpec Electronic, Inc. with the USB Implementers Forum, and b004 is the product ID that OnSpec Electronic, Inc. assigned to this particular model. When you run lsusb on Linux, this device appears as 55aa:b004 OnSpec Electronic, Inc. OnSpec MMC/SD Reader/Writer.
How to identify it on your system
Linux
$ lsusb Bus 001 Device 004: ID 55aa:b004 OnSpec Electronic, Inc. OnSpec MMC/SD Reader/Writer
You can filter directly with lsusb -d 55aa:b004, or get the full descriptor dump with lsusb -v -d 55aa:b004. Kernel messages from dmesg show the same pair as idVendor=55aa, idProduct=b004.
Windows
In Device Manager, open the device, go to Details → Hardware Ids. This device reports:
USB\VID_55AA&PID_B004 USB\VID_55AA&PID_B004&REV_0100
From PowerShell: Get-PnpDevice | Where-Object InstanceId -match "VID_55AA&PID_B004"
macOS
$ system_profiler SPUSBDataType
OnSpec MMC/SD Reader/Writer:
Product ID: 0xb004
Vendor ID: 0x55aa (OnSpec Electronic, Inc.)Driver help
Having driver issues with this device? Most USB devices are handled by a generic class driver; if yours shows up as an unknown device, confirm the ID above first, then check the manufacturer's downloads page.
Raw usb.ids entry
The exact lines this page is generated from, in the upstream source file:
55aa OnSpec Electronic, Inc. b004 OnSpec MMC/SD Reader/Writer