0403:e521 — EVER Sinline XL Series UPS

This is the USB identifier for a EVER Sinline XL Series UPS manufactured by Future Technology Devices International, Ltd. The vendor ID 0403 is registered to Future Technology Devices International, Ltd with the USB Implementers Forum, and e521 is the product ID that Future Technology Devices International, Ltd assigned to this particular model. When you run lsusb on Linux, this device appears as 0403:e521 Future Technology Devices International, Ltd EVER Sinline XL Series UPS.

Linux

$ lsusb
Bus 001 Device 004: ID 0403:e521 Future Technology Devices International, Ltd EVER Sinline XL Series UPS

You can filter directly with lsusb -d 0403:e521, or get the full descriptor dump with lsusb -v -d 0403:e521. Kernel messages from dmesg show the same pair as idVendor=0403, idProduct=e521.

Windows

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

USB\VID_0403&PID_E521
USB\VID_0403&PID_E521&REV_0100

From PowerShell: Get-PnpDevice | Where-Object InstanceId -match "VID_0403&PID_E521"

macOS

$ system_profiler SPUSBDataType
    EVER Sinline XL Series UPS:
      Product ID: 0xe521
      Vendor ID: 0x0403  (Future Technology Devices International, Ltd)

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. Future Technology Devices International, Ltd official support →

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

0403  Future Technology Devices International, Ltd
	e521  EVER Sinline XL Series UPS

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