Smlight SLZB-06M vs Sonoff Dongle Lite MG21

Updated March 2026

Data from Amazon and official Smlight and Sonoff sites.

2026 verdict

For 2026, Smlight SLZB-06M is the stronger overall choice. It builds its lead on power, connectivity, and antenna gain, then backs it up with a stronger showing on bluetooth proxy. The only strong reason to choose Sonoff Dongle Lite MG21 is if price and rating is more important to you than the overall verdict. That is why the final call still favors Smlight SLZB-06M.

Winner

Smlight

Smlight SLZB-06M

$74.99

BUY NOW

Sonoff

Sonoff Dongle Lite MG21

$19.90

BUY NOW

Feature	Smlight SLZB-06M	Sonoff Dongle Lite MG21	Winner
Price	$74.99	$19.90	Sonoff Dongle Lite MG21
Rating	4.5	4.7	Sonoff Dongle Lite MG21
Power	USB, PoE	USB	Smlight SLZB-06M
Connectivity	USB, Ethernet, 2.4 GHz Wifi	USB	Smlight SLZB-06M
Antenna Gain	+5dBi	+3dBi	Smlight SLZB-06M
Bluetooth Proxy	YES	NO	Smlight SLZB-06M
Amplifier Gain	+20dB	+20 dBm	Different strengths
Warranty	1 year	1 year	Tie
Zigbee Chip Model	EFR32MG21	EFR32MG21	Tie
Zigbee Router	YES	YES	Tie
Z-Wave Controller	NO	NO	Tie
Thread Border Router	YES	YES	Tie

Winner

Smlight

Smlight SLZB-06M

$74.99

BUY NOW

+ Power: USB, PoE
+ Connectivity: USB, Ethernet, 2.4 GHz Wifi
+ Antenna Gain: +5dBi
- Price: $74.99 vs $19.90
- Rating: 4.5 vs 4.7

Sonoff

Sonoff Dongle Lite MG21

$19.90

BUY NOW

+ Price: $19.90
+ Rating: 4.7
- Power: USB vs USB, PoE
- Connectivity: USB vs USB, Ethernet, 2.4 GHz Wifi

Frequently Asked Questions (FAQ)

Which is better overall: Smlight SLZB-06M or Sonoff Dongle Lite MG21?: Smlight SLZB-06M has the stronger overall profile in this comparison, especially for power, connectivity, and antenna gain.
What is the biggest difference between Smlight SLZB-06M and Sonoff Dongle Lite MG21?: Price is one of the clearest differences: Smlight SLZB-06M lists $74.99, while Sonoff Dongle Lite MG21 lists $19.90.
Which one looks better on price?: Smlight SLZB-06M is listed at $74.99, while Sonoff Dongle Lite MG21 is listed at $19.90. Sonoff Dongle Lite MG21 (better spec).
Who should buy Smlight SLZB-06M?: Choose Smlight SLZB-06M if your priority is power and connectivity and that matters more than price.
Who should buy Sonoff Dongle Lite MG21?: Choose Sonoff Dongle Lite MG21 if your priority is price and rating and that matters more than power.

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