This is an old and discontinued home Wifi extender, which plugs into your home wiring circuit. The lights still come on when plugged in but I haven't used it in years.
You'd need to do some research around setting it up, and you'll need a new cable to plug it into your main wifi router.
model = PowerLine AV Network Adapter DHP-306AV
Manual - https://eu.dlink.com/uk/en/-/media/consumer_products/dhp/dhp-306av/manual/d...
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