Sonoff Dongle Light LMG21 – USB Zigbee Adapter

The SONOFF Dongle-LMG21 (Dongle Lite MG21) is a compact USB Zigbee 3.0 coordinator that lets you create fast, reliable local control with Home Assistant, Zigbee2MQTT, openHAB, and other platforms. Built on the EFR32MG21 radio, the hardware provides a stable Zigbee mesh network, allowing bulbs, switches, and sensors from different brands to be paired and controlled within a single system.

The dongle works in a Plug&Play manner on Windows, Ubuntu, and Raspberry Pi OS (including Docker environments), and its external, ≤180° adjustable antenna delivers better range. For advanced users, flashable firmware is available (Zigbee NCP/Router, OpenThread RCP, MultiPAN), enabling configuration for multiple network roles as needed.

A cost-effective entry-/mid-tier solution for building your own Zigbee network with DIY-focused community support. Ideal as the backbone of small to medium smart homes.

About the SONOFF brand

SONOFF is one of the best-known brands in the DIY smart home community. Their portfolio includes Wi-Fi and Zigbee relays, switches, sensors, and gateways that offer great value and flexible integration with environments such as Home Assistant, eWeLink, openHAB, and Zigbee2MQTT.

Key Product Features

• Compact Zigbee coordinator: build a stable Zigbee 3.0 mesh network with cross-brand device pairing.
• Wide platform support: works with Home Assistant (ZHA), Zigbee2MQTT, openHAB, ioBroker, Domoticz, and Jeedom.
• Plug&Play setup: quick commissioning on Windows, Ubuntu, Raspberry Pi OS, and in Docker environments.
• Flashable firmware: Zigbee NCP/Router, OpenThread RCP, and MultiPAN modes for advanced configurations.
• External antenna: ≤180° adjustable for improved signal strength and range.

Smart Home Protocols and Platform Compatibility

• Supported protocols: Zigbee 3.0 (default); in advanced mode OpenThread RCP / MultiPAN (depending on firmware).
• Compatible platforms: Home Assistant (ZHA), Zigbee2MQTT, openHAB, ioBroker, Domoticz, Jeedom.
• Local control: manage paired Zigbee devices over LAN without the cloud.
• Operating systems: Windows, Ubuntu, Raspberry Pi OS; also usable with Docker.

Smart Features

• Create a Zigbee mesh: build a stable, scalable network with your own coordinator and unify devices.
• Cross-brand device management: integrate bulbs, switches, and sensors from various manufacturers.
• Advanced modes: with firmware swap, set up Router/RCP/MultiPAN modes for specialized use cases.

Electrical Functions

• Power supply: 5 V⎓ / 500 mA (via USB).

Other Characteristics

• Enclosure: PC+ABS housing.
• External antenna: adjustable, ≤180°.
• DIY focus: community guides available for advanced features (e.g., firmware flashing).

Technical Specifications

• Model: SONOFF Dongle-LMG21 (Dongle Lite MG21)
• SoC / radio: Silicon Labs EFR32MG21
• Protocol: Zigbee 3.0 (flashable: Zigbee NCP/Router, OpenThread RCP, MultiPAN)
• Compatibility: Home Assistant (ZHA), Zigbee2MQTT, openHAB, ioBroker, Domoticz, Jeedom
• OS support: Windows, Ubuntu, Raspberry Pi OS; Docker
• Power: 5 V⎓ / 500 mA (USB)
• Dimensions: 133 × 18.6 × 10.1 mm
• Operating temperature: 10–60 °C
• Humidity: 5–95% RH
• Note: Thread/MultiPAN features require a firmware update; setup is recommended for advanced users.

At the link below, you can access our sales support materials for individual products.
Available documents are organized by manufacturer in folders on Google Drive.

PRODUCT IMAGES

USER MANUALS

CERTIFICATES

BULB ENERGY CLASSES

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