27a8:a120 — Contactless + Chip Reader

This is the USB identifier for a Contactless + Chip Reader manufactured by Square, Inc.. The vendor ID 27a8 is registered to Square, Inc. with the USB Implementers Forum, and a120 is the product ID that Square, Inc. assigned to this particular model. When you run lsusb on Linux, this device appears as 27a8:a120 Square, Inc. Contactless + Chip Reader.

Linux

$ lsusb
Bus 001 Device 004: ID 27a8:a120 Square, Inc. Contactless + Chip Reader

You can filter directly with lsusb -d 27a8:a120, or get the full descriptor dump with lsusb -v -d 27a8:a120. Kernel messages from dmesg show the same pair as idVendor=27a8, idProduct=a120.

Windows

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

USB\VID_27A8&PID_A120
USB\VID_27A8&PID_A120&REV_0100

From PowerShell: Get-PnpDevice | Where-Object InstanceId -match "VID_27A8&PID_A120"

macOS

$ system_profiler SPUSBDataType
    Contactless + Chip Reader:
      Product ID: 0xa120
      Vendor ID: 0x27a8  (Square, Inc.)

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:

27a8  Square, Inc.
	a120  Contactless + Chip Reader

See all 1 devices from Square, Inc. →