0a81:0205 — PS/2 Keyboard+Mouse Adapter

This is the USB identifier for a PS/2 Keyboard+Mouse Adapter manufactured by Chesen Electronics Corp.. The vendor ID 0a81 is registered to Chesen Electronics Corp. with the USB Implementers Forum, and 0205 is the product ID that Chesen Electronics Corp. assigned to this particular model. When you run lsusb on Linux, this device appears as 0a81:0205 Chesen Electronics Corp. PS/2 Keyboard+Mouse Adapter.

Linux

$ lsusb
Bus 001 Device 004: ID 0a81:0205 Chesen Electronics Corp. PS/2 Keyboard+Mouse Adapter

You can filter directly with lsusb -d 0a81:0205, or get the full descriptor dump with lsusb -v -d 0a81:0205. Kernel messages from dmesg show the same pair as idVendor=0a81, idProduct=0205.

Windows

In Device Manager, open the device, go to Details → Hardware Ids. This device reports:

USB\VID_0A81&PID_0205
USB\VID_0A81&PID_0205&REV_0100

From PowerShell: Get-PnpDevice | Where-Object InstanceId -match "VID_0A81&PID_0205"

macOS

$ system_profiler SPUSBDataType
    PS/2 Keyboard+Mouse Adapter:
      Product ID: 0x0205
      Vendor ID: 0x0a81  (Chesen Electronics Corp.)

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.

The exact lines this page is generated from, in the upstream source file:

0a81  Chesen Electronics Corp.
	0205  PS/2 Keyboard+Mouse Adapter

• 0a81:0101 Keyboard
• 0a81:0103 Keyboard
• 0a81:0203 Mouse
• 0a81:0701 USB Missile Launcher
• 0a81:ff01 Wireless Missile Launcher

See all 6 devices from Chesen Electronics Corp. →