# ZigBee USB Dongle Sonoff Dongle-LMG21 for Home Assistant, openHAB, Zigbee2MQTT

**URL:** https://aio.lv/en/product--sonoff-dongle-lmg21--12089590
**Data updated:** 2026-03-13 09:02 (EET)
**Category:** Home Automation
**Manufacturer:** Sonoff
**Manufacturer code:** Dongle-LMG21
**EAN:** 6920075743456
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 16.99 €
**Prices and availability valid until:** 2026-07-25 23:59
**Price without VAT (21%):** 14.04 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--sonoff-dongle-lmg21--12089590

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 09.07.2026 | free |
| Pickup points | 14.07.2026 | 1.89 EUR |
| Courier delivery to door | 14.07.2026 | 4.99 EUR |

## Summary description

ZigBee USB dongle Sonoff Dongle-LMG21 provides a ZigBee coordinator interface for local home automation platforms such as Home Assistant, openHAB and Zigbee2MQTT. It connects via USB to a host and enables pairing and management of ZigBee devices, allowing central control, automation and monitoring of sensors, lights and smart plugs in a local network.

## Long description

SONOFF ZigBee USB Dongle-LMG21 provides a local ZigBee coordinator interface for Home Assistant, openHAB and Zigbee2MQTT. The compact USB dongle with an EFR32MG21 radio chipset and adjustable antenna enables pairing, control and monitoring of ZigBee sensors, lights and smart plugs on a local network without dependence on cloud services. It connects to a host via USB and supports multiple operating modes to suit different integration scenarios.
Advantages
The EFR32MG21 chipset delivers low power consumption and stable radio performance, which supports reliable operation across larger device deployments. Multi-mode functionality allows the dongle to act as a ZigBee coordinator, ZigBee router, Thread RCP or run in MultiPAN mode for simultaneous ZigBee and Thread use. A compact, robust housing and included 0.5 m USB extension cable reduce electromagnetic interference and ease installation with mini‑computers or SBCs. Vendor-supplied flashing tools and documentation simplify firmware changes and platform setup.
Suitable for
Connecting and managing ZigBee devices from Home Assistant
Integrating ZigBee networks with Zigbee2MQTT for local MQTT-based automation
Using openHAB as a local automation server for ZigBee devices
Building mixed ZigBee and Thread testbeds or Matter over Thread setups
Key specifications
Radio chipset: EFR32MG21 (Silicon Labs)
Supported standard: IEEE 802.15.4 (ZigBee/Thread compatible)
Operating modes: ZigBee coordinator, ZigBee router, Thread RCP, MultiPAN
Interface: USB (host connection for local platforms)
Power: 5 V ⎓ 500 mA (via USB)
Operating temperature: -10°C to 60°C
Housing: aluminum and PC+ABS
Dongle dimensions: 43 × 18.5 mm
Antenna: adjustable angle, length 90 mm
How to use
Connect the Sonoff Dongle-LMG21 to a host running Home Assistant, openHAB or Zigbee2MQTT using the USB port (use the included 0.5 m USB extension cable if needed to improve placement). Install the appropriate integration or firmware bridge on the host and follow the platform-specific discovery or pairing procedure to add ZigBee devices. Use the vendor flasher tool or documented steps when a firmware change is required; ensure the host recognizes the USB serial device and that required drivers or permissions are configured.
Usage recommendations
Place the dongle and antenna away from large metal objects and other radio-emitting devices. For best range and stability, position the antenna vertically in open space and, if necessary, use the USB extension cable to raise the dongle above or away from the host enclosure. Regularly check platform integration logs after firmware updates or major network changes to confirm stable coordinator operation.

## FAQ

### How much does the ZigBee USB Dongle Sonoff Dongle-LMG21 cost, and is it available for purchase?

The price is 16.99 € (valid at the time of publication and already includes all taxes). The item is available for order — 405 pcs. are in stock, and you can place your purchase right now with delivery across Latvia and Europe or choose pickup at the Riga collection point. We offer favorable purchase terms, including the option to split the payment into convenient monthly installments. Availability and price are updated in real time, so we recommend placing your order in advance.

### If I order this product today, when will I receive my order?

If you place your order today, delivery will be as fast and convenient as possible. You will be able to pick up your order on 09.07.2026 at the Riga pickup point or choose delivery across Latvia and Europe. We carefully inspect every purchase and pack it securely for safe transportation.

### What payment options are available?

AiO.lv offers several payment methods: Bank transfer, Bank cards on-line, Apple Pay, Google Pay. All transactions are 100% secure and encrypted.

### Can this product be purchased for a company (with VAT)?

Yes. AiO.lv works with legal entities in Latvia and across Europe. The product price already includes VAT. For certain product categories, as well as for companies from other EU countries with a valid VAT number, a 0% VAT rate may apply. We issue the invoice immediately after the order is placed, support electronic BIS invoices, and automatically generate all necessary accounting documents. You can complete the purchase for a company online — simply select the company profile and choose bank transfer as the payment method during checkout.

### What is the warranty period?

All Sonoff products come with an official 2 Years warranty. It covers all manufacturing defects and malfunctions that may occur during use. The warranty is valid at all authorized Sonoff service centers and through AiO.lv

### Can the product be returned after purchase?

Yes, you can return the product within 14 days of purchase if you bought it as a consumer (not a legal entity). Returns are possible without giving any reason — the main condition is that the product retains its original appearance and full set of accessories. We will make the process as simple and convenient as possible: just contact our customer support team, and we will help you arrange the return.

### Where should I contact for warranty service?

For warranty-related questions you can contact the AiO.lv (SIA VSPRO) customer support team. More information about warranty service: https://aio.lv/en/warranty

## Image

https://aio.lv/img/cache/product/12089590/67601909_large.webp