Quick overview from the supplier:
Whole-Home Mesh Dual Band Wi-Fi AC System MERCUSYS, "Halo S12(2-pack)", 1167Mbps,MU-MIMO,up to 260m3
// One Unified Network – With advanced Mesh Technology, Halo units work together to form a single unified whole-home network with one Wi-Fi name and password.
Seamless Roaming – Automatically switch between Halos as you move around your home, always getting the best signal to enjoy the fastest connections for all your devices.
Whole-Home Coverage – Blanket up to 2,800 ft² (260 m²) with high-speed Wi-Fi.
Hi-Speed Wi-Fi – Halo S12 provides fast and stable connections with speeds of up to 1,167 Mbps and works with major internet service providers (ISP) and modems.
Ultra-High Performance – Enjoy lag-free connection and non-stop entertainment on all your devices, at the same time.
