TP-Link Archer C7 User Manual page 18

Archer C7 AC1750 Wireless Dual Band Gigabit Router
Pressing this button for more than 5 seconds enables the Reset function. With the router
powered on, press and hold the WPS/Reset button (approximately 8 seconds) until the SYS
LED becomes quick-flash from slow-flash. And then release the button and wait the router
to reboot to its factory default settings.
Wireless antenna: To receive and transmit the wireless data.
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