Shelly i4 Gen3

Shelly i4 Gen3 is an advanced input module for smart home systems that allows you to manually control scenes, run synchronized actions, or activate complex automation scenarios. The device is small enough to be easily installed behind any standard wall switch, socket box, or even in limited space areas.

With an upgraded processor and increased memory compared to its predecessors, Shelly i4 Gen3 delivers instant response, stable operation, and wide integration possibilities with other Shelly devices and third-party systems.

It comes with a built-in web interface for setup and management, supports Wi-Fi and Bluetooth, works with Alexa, MQTT, HTTP/HTTPS, and can be a part of advanced home automation systems.

Key features

• 4 independent inputs — connect buttons or switches to activate up to 12 different actions.

• Wi-Fi & Bluetooth — stable connection without a hub, quick setup via Bluetooth.

• Local and cloud control — works autonomously in a local network or via Shelly Cloud.

• Virtual components — support for multi-device scenarios.

• Scripting & webhooks — advanced automation through HTTP, HTTPS, MQTT.

• BLE Gateway — bridge between Shelly BLU devices and the Shelly ecosystem.

• Wi-Fi Extender — boosts Wi-Fi signal for IoT devices.

• Amazon Alexa integration — voice control and automation.

• Overheating protection for safe operation.

Use cases

• Lighting control with a single button.

• Roller shutter control with a double-click.

• Home scenes — e.g., “leaving home”: one press turns off all lights and sockets.

• Voice control via Alexa.

• Automation in homes, offices, hotels.

Technical specifications

Power supply

• Input voltage: 110–240 V AC, 50/60 Hz

• Power consumption: < 1 W

Interfaces

• 4 button/switch inputs (SW1–SW4)

• Connectivity: Wi-Fi 802.11 b/g/n (2.4 GHz), Bluetooth 4.2

• Add-on interface: Shelly proprietary serial

Processor and memory

• MCU: ESP-Shelly-C38F

• Flash: 8 MB

Safety

• Overheating protection

• Operating temperature: -20 °C to +40 °C

• Humidity: 30–70 % RH

Size and mounting

• Size: 37 × 42 × 16 mm

• Weight: 19 g

• Mounting: in standard wall box

• Color: orange

Connectivity range

• Wi-Fi: up to 30 m indoors / 50 m outdoors

• Bluetooth: up to 10 m indoors / 30 m outdoors

Why choose Shelly i4 Gen3?

• Ultra-fast processor for instant reaction.

• Up to 12 actions in one device.

• Full scripting and advanced automation support.

• Compact size — fits even in the smallest boxes.

• Works with Alexa, MQTT, HTTP/HTTPS, and third-party systems.

• Extra features: Wi-Fi repeater and BLE gateway.