Shelly Plus i4 4-Digital Input Relay Controller

Shelly Plus i4 Smart Controller

The Shelly Plus i4 is a four-input Wi-Fi and Bluetooth controller designed to manage Shelly relays and other connected devices. It fits behind a standard wall switch and reads up to four digital inputs without providing any relay outputs itself. An ESP32 processor handles commands and notifications with minimal latency. The unit requires no separate hub and connects directly to the home network.

Installers wanting manual scene control

Home-automation enthusiasts who want physical buttons to trigger scenes, dim lights or toggle multiple devices will benefit from the multi-click support that enables up to 12 distinct actions per input. The device also works as a Wi-Fi range extender for other Shelly products. Buyers who need a controller that can directly switch mains loads should look elsewhere, because this model only reads inputs and does not contain relays.

Four digital inputs with multi-click

The decisive specification is the four digital inputs that each support multi-click sequences for up to 12 possible actions. This input count and action density determine whether the controller can replace a traditional multi-gang switch or handle the desired number of lighting zones and scenes. Verify that the installation location provides a Wi-Fi signal and that the controlled devices are compatible with Shelly, HTTP or MQTT commands.