Wave i4 DC is perfect for Shelly Wall Switch for Smart Relays – a 4 button switch. Each button can activate up to 4 different actions. That means that only one 4 button switch would allow as much as 16 scenes trigger and execution! Thanks to its compact dimensions and simple wiring, Shelly Wall Switch can fit into any existing switch console or even the tiniest spaces. No expansion of the wall space or any changes in the wiring needed!