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There are multiple revisions of the TL-WN781ND

Note: Please verify the hardware version of your device for the firmware version. Wrong firmware upgrading may damage your device and void the warranty. If you can't find the hardware version or you are not certain about it, please click here for more details.

Hardware Version Description
TL-WN781ND V2 150Mbps Wireless Lite N PCI Express Adapter
TL-WN781ND V1 150Mbps Wireless Lite N PCI Express Adapter