Shelly Plus i4 UL WiFi 4 Digital Inputs

The Shelly Plus i4 UL is a compact Wi-Fi input controller designed to transform up to four standard wall switches or push buttons into powerful smart home controls. Unlike a relay, the Plus i4 UL does not switch electrical loads directly. Instead, it detects switch actions and uses them to trigger automations, scenes, or commands for other Shelly devices and compatible smart home systems.

Perfect for residential and commercial automation, the Plus i4 UL fits behind most existing wall switches, allowing you to create advanced lighting controls, multi-button keypads, scene activation, and custom automation without changing the appearance of your installation.

Key Features

• Four independent switch inputs
• UL Listed for North American installations
• Wi-Fi connectivity with no hub required
• Bluetooth support for fast setup and device pairing
• Multi-click detection including single, double, triple, and long press actions
• Supports custom scripting for advanced automation
• MQTT, HTTP API, and webhooks for third-party integrations
• Embedded web interface for local configuration
• Compatible with Shelly Smart Control, Home Assistant, Node-RED, and other automation platforms
• Compact design fits inside most standard electrical wall boxes

Technical Specifications

• Model: Shelly Plus i4 UL
• Device Type: Smart Wi-Fi Input Controller (No Relay Outputs)
• Power Supply: 110–240 VAC ±10%, 50/60 Hz
• Inputs: 4 switch/button inputs
• Wireless Connectivity: Wi-Fi 802.11 b/g/n (2.4 GHz)
• Bluetooth: Bluetooth 4.2 for device inclusion and gateway functionality
• Processor: ESP32 dual-core microcontroller
• Memory: 8 MB Flash
• Power Consumption: Less than 1.2 W
• Operating Temperature: -20°C to 40°C (-5°F to 105°F)
• Dimensions: 42 × 37 × 16 mm (1.65 × 1.46 × 0.63 in)
• Installation: Fits behind standard wall switches and push buttons
• Control Methods: Local web interface, Shelly Smart Control app, MQTT, REST API, HTTP/HTTPS webhooks, JavaScript scripting
• Compatibility: Home Assistant, Node-RED, SmartThings, and other platforms supporting Shelly integrations
• Certifications: UL Listed, FCC, IC, Wi-Fi Certified