The Shelly Wall Display is an intuitive 4 inch (10 cm) wall display with which you can centrally control and monitor all devices in your smart home; whether you dim the light, adjust the room atmosphere or ensure optimal energy efficiency: with this smart display, you can control your smart home easy; together with the Shelly BLU H&T, the Shelly wall display can be used as a smart Aoperate this for the ensures a perfect temperature indoors; you can easily arrange and adjust the layout to display up to six devices that are most important to you.Shelly BLU H&T is a water/dust-resilient Bluetooth sensor that precisely measures temperature and humidity levels.