How do I activate Wi-Fi Protected Setup (WPS) on the Deskjet 2540?
Press and hold the Wireless button for more than three seconds until the light blinks to start Wi-Fi Protected Setup (WPS) push button mode. This allows you to connect the printer to a WPS-compatible router without manually entering a network password. (Page 2)
From the official HP Deskjet 2540 All-in-One Printer manual, page 2
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