I already had an installation Devolo DLAN PLC 200AV mini functioning perfectly. Being in a property with very thick walls, the wifi does not pass into many pieces. So I bought this case Devolo 200 AV Wireless N, compatible with my existing Devolo installation. I had to plug it into any electrical outlet and thus I get wifi in my house. So quite satisfied with this product. I should note that before making the purchase, I phoned Devolo order to have their advice on the compatibility of the product, good customer relations. And of course congratulations to Amazon for quick shipping