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Description
SONOFF DONGLE-LMG21 ZIGBEE/T USBA Compact USB Dongle with ZIGBEE 3. 0 Openthread Support, EFR32MG21 Chip, Enabling Reliable Local Smart Home Control on Home Assistant or ZIGBEE2MQTT. Compact USB Dongle Overview 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
A Compact USB Dongle with ZIGBEE 3.0/Openthread Support, EFR32MG21 Chip, Enabling Reliable Local Smart-Home Control on Home Assistant or ZIGBEE2MQTT.
Compact USB Dongle
Overview
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.
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.
Specifications
- Power supply: 5 V⎓ / 500 mA (via USB)
- Enclosure: PC+ABS housing.
- External antenna: adjustable, ≤180°.
- DIY focus: community guides available for advanced features (e.g., firmware flashing).
- 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.
Additional Information
| Device | Dongle |
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.9 ★★★★★
Based on 18 reviews
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Product Reviews
★★★★★ 5
Great watch, would recommend
Color: blue watches 58, Color: blue watches 58
I really like this watch because it looks amazing. It’s much lighter than I expected, so it’s comfortable to wear all day at school without feeling heavy. When I first got it, the metal band was a little bit squeaky, but after wearing it for a while, the noise completely
stopped. I had to remove a few links to make it fit my wrist, but the adjustment was actually really easy to do yourself. The clasp is great too it stays closed and it doesn’t pinch my skin at all. The blue and gold colors look awesome together, and it’s definitely a great watch for the price
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Reviewed in the United States on February 14, 2026
★★★★★ 5
My new favorite watch. Simple home improvement needed
Color: all black watch mens, Color: all black watch mens
Despite having many reknown brand watches in my collection, these inexpensive Olevs watches are now my favorite.
They look nice, cost practically nothing and so far are very accurate (10 day review). Little to worry about if lost or damaged.
PROS:
1. Inexpensive $40/each.
2. As stylish as other fashion watches 5x-10x more expensive.
3. Watch Crystal (i.e., glass) has a unique, faceted shape, which reflects light, feels "Manly" and matches faceted bezel.
4. Light weight and slim case; fits small wrists nicely (I have 6.4" wrists).
5. Accurate - two watches tracked over 10 days. Watch one: -7 seconds/10 days. Watch two: +2 seconds/10 days.
6. Illuminescent (i.e., glow-in-the-dark) hands and watch face look decent in dark.
CONS:
7. Lightweight and cheap material - durability is questionable, especially coatings.
8. Bracelet/band links have excessive gaps to each other and rattle badly, making watch noisy and embarrassing. *Home fix*
9. Faceted Crystal can make it difficult to see exact time, because of light reflection.
10. Single clasp on bracelet could easily open inadvertently, vs double clasp.
11. Crown is not threaded and spins freely, even when closed (doesn't change time); likely poor water proofing and crown can easily open.
12. Difficult to set time accurately; crown movement is figity and closing crown can cause hands to easily move.
13. Second hand doesn't exactly line up with tick marks making it difficult to know if actual time is before, or after tick mark.
*AT HOME FIX*:
To fix the noisy bracelet, simply cut to length a piece of waterproof medical tape 15-16mm (5/8") wide, then attach to inside of clean bracelet, while spreading the links apart with your finger (i.e., stretch band). Do this on each bracelet, but don't cover clasp. Tape will need to be replaced, as it gets dirty, but it makes watch quiet.
- Watch dimensions for collectors -
A) Case Diameter (to Crown): 44mm
B) Case Diameter: 42mm
C) Lug-to-Lug length: 50.5mm
D) Case Thickness (Top of Crystal): 12.6mm
E) Strap/Bracelet Width at Case: 20mm
F) Strap/Bracelet Width at Clasp: 18mm
G) Weight 6.4" wrist size: 100g (3.5oz)
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Reviewed in the United States on May 12, 2025
★★★★★ 4
It's a watch
Color: blue watch for men
Not a bad watch. Cheap, looks good and works.
Take it to your local jeweler and they can pop the links out in no time.
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Reviewed in the United States on May 19, 2026
★★★★★ 5
Nice But Overpaid
Color: Black Embossed
Very happy about the purchase. The style is great, size is perfect, and the leather is really nice. When I unpacked it, the MSRP ticket was inside showing the cost of $125, but I paid $150. Not so happy about that part.
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Reviewed in the United States on January 5, 2026
★★★★★ 5
Muy buen producto
Color: Black Embossed
De muy buena calidad!!!
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Reviewed in the United States on December 1, 2025