Find your USB device and vendor id
Under Linux
enter the command:
lsusb -vv
or plug in the device and enter the command:
dmesg
Under Windows
- From your Windows Desktop, click Start-> Run and type devmgmt.msc and click Ok
- Under Disk drives, locate and double click your "USB Flash Device":
(ouf course your device may not be a 'Disk device', then find it in the appropriate category)

- From the USB Device Properties window that opens, click the Details tab. Select the entry listed under the Device Instance ID Window and then press ctrl+c to copy the text:
It should look like: USB\VID_0718&PID_0432\078A175D050E