Shelly i4

The Shelly i4 is a WiFi scene controller that converts up to four standard switches into smart input triggers without controlling loads directly. This unique device connects behind a switch plate and reports button states to your smart home system, enabling switches to trigger complex automations, scenes, or control devices anywhere in your home. No load wiring connects to the i4—it's purely an input device.

Each of the four inputs supports multiple action types including short press, double press, and long press for extensive scene control possibilities. The device works with existing switches of any type—momentary, toggle, or rocker—providing flexibility in hardware choices. Power comes from line voltage, eliminating battery concerns.

The Shelly i4 excels in Home Assistant setups where button presses can trigger virtually any automation. Amazon Alexa and Google Home integration through Shelly Cloud enables voice-controlled scene activation. This device is particularly valuable when you want to keep existing high-quality switches while adding smart functionality, or when creating multi-way control scenarios without complex wiring.