Easy to install,
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This review is from: TP-Link TL-WA850RE 300Mbps Universal Wall Plug Range Extender/ Wi-Fi Booster (WPS function, Easy Configuration) (Accessory)
Excellent product, works right out of the box; you can even configure it via WiFi, so even if your router / WiFi access point doesn't have a WPS button you don't need a PC with an Ethernet card to get it running - simply use your iPad or similar.
Has improved the signal in the lounge where the existing WiFi was a bit patchy - well worth the purchase price.