Smlight SLZB-MR1U vs Sonoff Dongle Lite MG21

Updated March 2026

Data from Amazon and official Smlight and Sonoff sites.

2026 verdict

For most buyers in 2026, Smlight SLZB-MR1U is the safer pick. Its biggest wins come from power, connectivity, and antenna gain, and dual network and bluetooth proxy adds more confidence to the verdict. You should still consider Sonoff Dongle Lite MG21 if its specific feature mix matters more than raw overall balance. In practical terms, Smlight SLZB-MR1U is the easier product to recommend.

Winner

Smlight

Smlight SLZB-MR1U

Price unavailable right now

BUY NOW

Sonoff

Sonoff Dongle Lite MG21

$19.90

BUY NOW

Feature	Smlight SLZB-MR1U	Sonoff Dongle Lite MG21	Winner
Power	USB, PoE	USB	Smlight SLZB-MR1U
Connectivity	USB, Ethernet, 2.4 GHz Wifi	USB	Smlight SLZB-MR1U
Antenna Gain	+5dBi	+3dBi	Smlight SLZB-MR1U
Dual Network	YES	NO	Smlight SLZB-MR1U
Bluetooth Proxy	YES	NO	Smlight SLZB-MR1U
Zigbee Chip Model	EFR32MG21 / CC2652P7	EFR32MG21	Different strengths
Amplifier Gain	+20dB	+20 dBm	Different strengths
Warranty	1 year	1 year	Tie
Zigbee Router	YES	YES	Tie
Z-Wave Controller	NO	NO	Tie
Thread Border Router	YES	YES	Tie
Matter Bridge	NO	NO	Tie

Winner

Smlight

Smlight SLZB-MR1U

Price unavailable right now

BUY NOW

+ Power: USB, PoE
+ Connectivity: USB, Ethernet, 2.4 GHz Wifi
+ Antenna Gain: +5dBi

Sonoff

Sonoff Dongle Lite MG21

$19.90

BUY NOW

- Power: USB vs USB, PoE
- Connectivity: USB vs USB, Ethernet, 2.4 GHz Wifi

Frequently Asked Questions (FAQ)

Which is better overall: Smlight SLZB-MR1U or Sonoff Dongle Lite MG21?: Smlight SLZB-MR1U has the stronger overall profile in this comparison, especially for power, connectivity, and antenna gain.
What is the biggest difference between Smlight SLZB-MR1U and Sonoff Dongle Lite MG21?: Power is one of the clearest differences: Smlight SLZB-MR1U lists USB, PoE, while Sonoff Dongle Lite MG21 lists USB.
Who should buy Smlight SLZB-MR1U?: Choose Smlight SLZB-MR1U if your priority is power and connectivity and that matters more than the competing advantages.
Who should buy Sonoff Dongle Lite MG21?: Choose Sonoff Dongle Lite MG21 if your priority is its specific strengths and that matters more than power.

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