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Definition: network extender

A device that extends the range of a network or interconnects two different types of networks. A network extender may refer to Wi-Fi, cellular (wireless) or Ethernet (wired). See bridge, Wi-Fi bridge, femtocell, cellular network extender and media extender.

A Verizon 5G Extender
With the antenna placed by the window, this innocuous-looking black box amplifies cellular signals for the Verizon network.