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-45%SKU: 1005010205954777

SONOFF Dongle Lite MG21 Zigbee/Thread USB Dongle Dongle-LMG21 EFR32MG21 Compact Size 65% Smaller than ZBDongle-E Cost-Effective

Name: SONOFF Dongle Lite MG21 Zigbee/Thread USB Dongle Dongle-LMG21 EFR32MG21 Compact Size 65% Smaller than ZBDongle-E Cost-Effective
Brand: SONOFF
SKU: 1005010205954777
Price: 19.2 USD
Availability: InStock
Rating: 53 (13 reviews)

Verified 4d ago

$19.20$34.91Save $15.71

$3 above 30-day low→ Stable

Expert Verdict

The Sonoff Dongle Lite MG21 uses the Silicon Labs EFR32MG21 radio and ships as a USB Zigbee 3.0 coordinator that can be flashed to run Thread (RCP/Border Router). It’s a compact, USB-only stick with an included extension cable and antenna, offering proven Zigbee support and Thread upgradability, but it lacks the extra flash/RAM, stronger antenna, and alternative connectivity (Ethernet/PoE/Wi‑Fi) found in the MG24 family.

Best For

Best for Home Assistant or Zigbee2MQTT DIY users who want a compact EFR32MG21 USB coordinator and optional Thread flashing; avoid if you need Ethernet/PoE, extra flash/RAM, or an out-of-box Thread Border Router.

Price History

Expert Quality Score

53/ 100

Reviewed by 11 expert sources

high confidence

⚠️ Community Differs from Experts

Experts: 53 / 100 · Community: 0 / 100

Pros

+Flashable to Zigbee or Thread, enabling future Matter/Thread roles for the network
+Uses Silicon Labs EFR32MG21 radio — same proven chip as other popular dongles
+Compact USB form-factor with included extension cable reduces USB-port RF interference
+Works with Home Assistant and Zigbee2MQTT for local, self‑hosted automation control

Cons

−USB‑only device — no Ethernet, PoE, or Wi‑Fi options for flexible placement
−Less flash and RAM compared with MG24 models, limiting headroom for large networks
−For best Thread/Border Router use you must manually flash appropriate RCP firmware

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