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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
4.2 ★★★★★
Based on 8 reviews
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Product Reviews
★★★★★ 3
Warranty issue
Caution when punching Anker products. If it is not direct from Amazon they will not warranty it.
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Reviewed in the United States on June 10, 2026
★★★★★ 5
Anker never disappoints
I've been using this for the past 3 days, and I have to say it's way better than my previous 10-port USB-C hub, which had stopped working. I like the design of this new hub, where the HDMI, PD, and Ethernet ports are all in the same area and located at the back. In comparison, my previous hub had its ports scattered all over the place. This hub only gets lightly warm, whereas my previous one used to get super hot, which I think might have contributed to its failure. I appreciate the fact that it has a power light to indicate when it's on. It's also more compact, which I like. I've had no issues with my other Anker devices, and so far I'm really liking this hub.
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Reviewed in the United States on August 30, 2024
★★★★★ 5
Great low cost USB C to 4K HDMI splitter adaptor
Color: Black
The Anker USB C Hub 5-in-1 USBC to HDMI splitter with 4K display with one powered USB c and 2 USB A ports works flawlessly and is a perfect travel companion or simple and inexpensive desktop dock to connect a moderan USB C only laptop to a large monitor up to 4K resolution. It supports 4K at 60 Hz so not for high speed gaming but it is flicker free for daily work where running at 60 Hz provides a clean looking 4K display. The USB C and USB A ports work perfectly. I already have four of these in different port configuration but wanted the 4K extension for travel and this was the best one for quality and bang for the buck.
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Reviewed in the United States on May 4, 2026
★★★★★ 5
Compact hub that punches well above its size
Color: Black
This hub handles 4K HDMI output and three data ports cleanly without any noticeable lag or connection issues. The powered ports on both the USB-C and USB-A sides are a useful feature for running peripherals without draining the host device. Compact enough to leave plugged in permanently without getting in the way. Works reliably on MacBook and Dell machines as described. Good value for a well-built hub with a solid feature set.
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Reviewed in the United States on June 8, 2026
★★★★★ 5
Compact, Travel friendly, Works well with ROG ALLY
Color: White
This is a compact and well built adapter, and it is travel friendly. I use it for my ROG ALLY when I don’t want it docked and still need charging and other device inputs. It has just about enough ports for what I need, usb-c power delivery port for charging (ROG ALLY can still run at maximum performance using this with a 100W charging brick and a cable that allows 100W power pass through). I use the remaining USB-C port and two USB-A ports for external hard drives or gaming controller 2.4Ghz receiver. Transferring files between ROG ALLY and an external SSD with this adapter is fast, could reach above 380 mb/s. All the device inputs were as advertised, “plug and play”. The hdmi port also gives me an option to connect my ROG ALLY to TV when I don’t have the dock which takes up more space for traveling. One thing to note, you will have to use the USB-C port on your PC which provides more power (usually at the back and not on the front of the pc), if not plugged in to a power source. When I received my first order, I plugged it into the front USB-C port of my mini PC, just for my wired keyboard and mouse, the computer didn’t recognize it and couldn’t get any input from my keyboard and mouse. I returned the first one and thought it wouldn’t work as I expected. A few days later when I was using another Anker 7 in 1 USB-C adapter, I ran into the same issue but I know that adapter had been working well, then I realized I had to plug it into the port on the back of the PC. So I got this again and tried, it just worked like a charm. Hope they actually mentioned it on their product page so I wouldn’t have to return the first one. The cable length on this adapter is just right, not too long or too short when using with ROG ALLY (not hanging, since the cable is pretty sturdy, when I picked up the ROG ALLY, the adapter just comes along).
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Reviewed in the United States on August 18, 2025
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