At the heart of the dongle is Silicon Labs’ EFR32MG21 – low power consumption, high sensitivity, and reliable operation even in dense Zigbee installations.
Support for Zigbee, Thread, and MultiPAN lets you scale your smart home and get ready for Matter over Thread. Easy firmware reflashing.
The external swivel antenna significantly improves coverage – up to approximately 140 m in open space. Use the included USB extension cable for optimal placement.
The SONOFF Dongle LMG21 is a universal USB gateway for building a robust smart home network. The proven EFR32MG21 chip from Silicon Labs ensures low power consumption, stable communication, and reliable performance even in larger installations. Thanks to its open compatibility, it integrates seamlessly with Home Assistant, Zigbee2MQTT, and openHAB, giving you full control over your data and local operation.
The external, positionable antenna increases range and signal quality – up to 140 m in open space. The compact body with a durable enclosure is approximately 65% smaller than the previous generation, so it won’t block your USB port. The package includes a USB extension cable for optimal placement away from interference sources, further improving wireless stability.
Main advantages:
- Zigbee and Thread (MultiPAN) including coordinator/router/RCP modes
- Fast flashing with the SONOFF Dongle Flasher tool
- Open compatibility with Home Assistant, Zigbee2MQTT, and openHAB
- High range and stability thanks to the external adjustable antenna
- Compact and durable design with aluminum elements
