Replace your ordinary switches with Shelly BLU Wall Switch 4! Easily mountable, on any wall, without any wiring, Shelly BLU Wall Switch 4 lets you manage lighting, appliances and activate scenes from one place. Configure the four customizable buttons to perform up to 16 actions - turn appliances on and off, adjust dimming, or activate scenes. For example, you could use it to shut down all non-essential devices when leaving home with just 1 button press.