With TP-Link expansions for routers, you can expand your TP-Link Deco mesh Wifi system. So you can provide more WiFi coverage in your home. Doesn't your current TP-Link Deco provide coverage in the attic, for example? In that case, you can add an extra station to get WiFi in the attic. We recommend choosing a Deco expansion of the same type as your current router. Do you have a TP-Link Deco M9? Then choose a TP-Link Deco M9 expansion. This way, you can be sure you get the best WiFi result.