1781:1ef1 — E1701 Modular Controller Card

This is the USB identifier for a E1701 Modular Controller Card manufactured by Multiple Vendors. The vendor ID 1781 is registered to Multiple Vendors with the USB Implementers Forum, and 1ef1 is the product ID that Multiple Vendors assigned to this particular model. When you run lsusb on Linux, this device appears as 1781:1ef1 Multiple Vendors E1701 Modular Controller Card.

Linux

$ lsusb
Bus 001 Device 004: ID 1781:1ef1 Multiple Vendors E1701 Modular Controller Card

You can filter directly with lsusb -d 1781:1ef1, or get the full descriptor dump with lsusb -v -d 1781:1ef1. Kernel messages from dmesg show the same pair as idVendor=1781, idProduct=1ef1.

Windows

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

USB\VID_1781&PID_1EF1
USB\VID_1781&PID_1EF1&REV_0100

From PowerShell: Get-PnpDevice | Where-Object InstanceId -match "VID_1781&PID_1EF1"

macOS

$ system_profiler SPUSBDataType
    E1701 Modular Controller Card:
      Product ID: 0x1ef1
      Vendor ID: 0x1781  (Multiple Vendors)

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:

1781  Multiple Vendors
	1ef1  E1701 Modular Controller Card

• 1781:0c31 Telldus TellStick Duo
• 1781:0c9f USBtiny
• 1781:1eef OpenAPC SecuKey
• 1781:1ef0 E1701 Modular Controller Card
• 1781:1ef2 E1803 Compact Controller Card

See all 26 devices from Multiple Vendors →