TP-LINK RE300 / AC1200 Mesh Wireless Range Extender /

Quick overview from the supplier:

AC1200 Mesh Wireless Range Extender TP-LINK "RE300", 1200Mbps // Extends dual-band Wi-Fi across your home to eliminate Wi-Fi dead zones. Creates a Mesh network by connecting to a OneMesh router for seamless whole-home coverage. Operates over both the 2.4 GHz band (300 Mbps) and 5 GHz band (867 Mbps)*1 for more stable wireless experience. Smart signal indicator helps to find the best location for optimal Wi-Fi coverage by showing the signal strength. Push the WPS button to easily set up a Mesh network you can uniformly manage from the Tether app or Web UI.