The Shelly i4 Gen3 can manage four digital inputs and allows you to manually activate or deactivate any created scene, synchronize actions, or execute complex trigger scenarios. You can activate various devices, control lighting, close blinds, and instantly activate scenes from one location. Compact enough to fit behind most wall switches, the Shelly i4 Gen3 is retrofittable and takes less than ten minutes to install under a standard 4-button switch.