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Small white rectangular smart controller with four input terminals

Shelly

Shelly Plus i4 Smart Controller 4 Inputs 16 Actions

SKU CH-0AB7-VTJZJ

Four-input smart controller triggers up to 16 actions and fits behind standard wall switches

  • Controls up to 16 actions from four inputs
  • Fits behind standard wall switches for clean installs
  • Manages scenes and devices via app or voice
  • Embedded web server enables local setup and control
  • Extends Wi-Fi coverage while adding smart control

Four-Input Smart Controller

The Shelly Plus i4 is a compact Wi-Fi and Bluetooth controller that fits behind standard wall switches to give four physical inputs for smart-home automation. It lets you trigger scenes, synchronise actions or run complex scenarios across other connected devices without replacing existing wiring. The embedded web server and app integration allow remote monitoring and control from anywhere with internet access. It suits homeowners and installers adding smart control to traditional toggle or momentary switches.

Upgrade From Basic Switches

Replacing dumb wall switches with this module adds up to 16 programmable actions per input, including single, double and long-press functions. The jump is worth it when you want local manual control that also drives remote relays, sensors or HTTP/MQTT endpoints without a separate hub. It also extends Wi-Fi coverage for other Shelly devices, reducing dead zones in larger homes. Keep using your current switches; the intelligence moves behind them.

Fits Behind Any Wall Switch

The controller mounts inside standard electrical boxes behind power sockets or light switches, requiring only a neutral and live connection for power. It frees up wall space by eliminating the need for bulky smart-switch faceplates while preserving the tactile feel of your existing buttons. Each of the four inputs can be mapped independently in the Shelly app or via the local web interface. No additional bridge or gateway is required for basic operation.

Highlights

  • Controls up to 16 actions from four inputs
  • Fits behind standard wall switches for clean installs
  • Manages scenes and devices via app or voice
  • Embedded web server enables local setup and control
  • Extends Wi-Fi coverage while adding smart control

Specifications

BrandShelly

Questions about this item

What size electrical box does the Shelly Plus i4 need to fit behind a wall switch?

The controller is designed to fit in most standard electrical boxes and behind wall switches or power sockets where space is limited.

How is the Shelly Plus i4 connected and configured for the first time?

It connects to your Wi-Fi network and is set up through its embedded web interface or the Shelly app; a common mistake is not placing it within reliable Wi-Fi range of the router.

Will the internal relay contacts or wireless module need replacement after extended use?

The device has no internal relay contacts — it reads four switch inputs to trigger up to 16 actions on other connected devices, so there are no moving parts to wear out.

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