Shelly Plug US Gen4: Smart Wi-Fi Outlet

The Shelly Plug US Gen4 is a US smart plug with Matter certification plus Wi-Fi, Bluetooth and Zigbee, so it works with your existing smart home ecosystem. It turns a standard outlet into a remotely controlled one, for resistive loads up to 1800 watts, and it reports energy use.

A Quick Look

The Shelly Plug US Gen4 comes in white and black. Besides switching power, Shelly's spec page says it works as a Wi-Fi extender, a Bluetooth Low Energy gateway and a Zigbee router, which can help a home environment with weak coverage in one corner.

Key Features and Capabilities

The Shelly Plug US Gen4 packs these features into a compact body:

Key Points

• Matter certification ensures broad compatibility across smart home platforms
• Multi-protocol connectivity including Wi-Fi (802.11 b/g/n/ax), Bluetooth 5 LE, and Zigbee
• Real-time energy monitoring with power and energy meters for consumption tracking
• Switching up to 15 amperes and 1800 watts, for resistive loads only per Shelly's spec
• Built-in light sensor reporting three illuminance levels (bright, twilight, and dark)
• Multicolor LED indicator for status feedback with customizable brightness and colors
• Protection against overheating, overvoltage, overcurrent, and overpower
• Local automation support through JavaScript scripting and pre-programmed scripts from the library
• Schedules and scenes for sophisticated home automation routines

The Specs

Shelly's knowledge base lists these figures (model S4PL-00116US, 120 V, 60 Hz):

The device includes an internal temperature sensor for thermal monitoring and a light sensor for ambient illuminance detection, enabling intelligent automations based on environmental conditions. The Wi-Fi range extends up to 30 meters (100 feet) indoors and 50 meters (160 feet) outdoors, while Zigbee connectivity reaches up to 100 meters (328 feet) indoors and 300 meters (984 feet) outdoors.

Ecosystem and Compatibility

The Shelly Plug US Gen4 is notable through its comprehensive multi-protocol approach to connectivity. Shelly lists Apple HomeKit, Amazon Alexa (Power Controller), Google Home (On/Off) and Samsung SmartThings (Switch, Power Meter), and Home Assistant supports Shelly devices as well. If you'd rather use Z-Wave, the Shelly Wave Plug US is the alternative.

Matter is the default firmware. Five rapid presses of the button switch it to Zigbee firmware, and three presses start Zigbee commissioning. The device supports local control through its web interface, MQTT and scripting, so it can run without the cloud. Shelly's page lists encryption but doesn't give the TLS version.

The Bluetooth 5 LE connection is quoted at 10 meters (33 feet) indoors and 30 meters (98 feet) outdoors. As a gateway and router, it can extend coverage for other smart home devices in your network.

Energy Monitoring and Optimization

Real-time energy monitoring is a main feature. The plug has a voltmeter, ammeter, and power and energy meters, and you read the data in the Shelly Smart Control app or in compatible platforms. That lets you spot power-hungry appliances and schedule them for off-peak hours.

Custom automation rules can turn devices on or off based on consumption thresholds, time-of-day schedules, or triggered conditions. The plug also has an internal temperature sensor and overheating protection for itself.

Use Cases in Smart Home Applications

The Shelly Plug US Gen4 excels in numerous real-world scenarios:

• Controlling space heaters and portable fans with automatic schedules during winter months
• Remote activation of resistive appliances from your smartphone (check the load type first, since inductive loads are outside the 1800 W resistive rating)
• Automating outdoor or decorative lighting based on sunset and sunrise times or manual control
• Monitoring television and entertainment system power consumption to reduce phantom loads
• Turning water fountains or pond pumps on automatically during daylight hours using the built-in light sensor
• Creating scenes that power multiple devices simultaneously for entertainment or security purposes

Advanced Automation Scenarios

Beyond on/off control, the plug supports threshold-based rules: switch a load off when power draw passes a limit, or when it's dark. JavaScript scripting allows duty-cycling an appliance or coordinating several plugs. The light sensor only reports three levels (bright, twilight, dark), so it suits coarse day/night rules, not lux-based control. A space heater is a resistive load, but keep it well under the 1800 W limit and check the heater's own manual for plug-in use.

Up and Running

Getting your Shelly Plug US Gen4 operational requires minimal technical knowledge. Begin by plugging the device into a standard wall outlet where you want to control power. Download the Shelly Smart Control app on your smartphone and follow the intuitive pairing process. The app guides you through Wi-Fi connection, naming the device, and choosing your preferred control method-local, cloud-based, or both.

For Matter integration, add the device through your platform's native app (Apple Home, Google Home, or Amazon Alexa) using the device's Matter code. Per Shelly's documentation, the first power-up starts in access point mode (blue flashing LED). Once added, you can control the plug and create automations directly within your chosen ecosystem. Advanced users can access the technical documentation to configure MQTT, webhooks, and custom JavaScript automation for specialized applications.

The multicolor LED indicator shows status, such as blue flashing for access point mode and purple flashing for Zigbee commissioning. When the plug is on, the LED can shift from green through yellow to red with load, or use a custom color, and you can adjust its brightness.

Safety and Protection Features

The Shelly Plug US Gen4 incorporates multiple layers of electrical protection. Shelly lists overheating, overvoltage, overcurrent and overpower protection. The spec page gives a 750 C glow-wire rating and doesn't list UL or FCC certification, so check the marking on the unit or the retailer's listing if you need a listed product.

The device receives firmware updates through the app.

Smart Home Ecosystem Flexibility and Future-Proofing

The plug supports Matter, Wi-Fi and Zigbee, so you can choose by hub. Matter is the default firmware and Zigbee is a firmware switch, so plan on one or the other per unit. Local control and scripting mean basic automations don't have to depend on the cloud.

Practical Integration with Existing Smart Homes

Whether you're transitioning from proprietary single-brand systems or expanding a heterogeneous multi-manufacturer setup, the Shelly Plug US Gen4 is meant to fit. In Zigbee firmware it acts as a router that strengthens the mesh. In the default Matter firmware you get a Matter endpoint for HomeKit, Google Home or Alexa. We haven't tested whether a single plug fixes weak coverage in a given house, so treat that as a possible side benefit.

So, Is It for You

This is a good choice if you want a Matter smart plug with energy metering and local scripting, for resistive loads on a 120 V US circuit. Its protocols, built-in sensors and local automation suit people who value both convenience and control. Look elsewhere if you need to switch motors or other inductive loads near the 15 A limit, or if you need a certification mark confirmed by the spec page. The energy consumption data is the main reason to buy.

This review is based on Shelly's published specifications, not hands-on testing.