Smlight SLZB-MR2 vs Sonoff Dongle Lite MG21

Updated March 2026

Data from Amazon and official Smlight and Sonoff sites.

2026 verdict

Taken as a whole in 2026, Smlight SLZB-MR2 wins this matchup. The comparison tilts its way because of rating, power, and connectivity, with antenna gain and dual network keeping it in front. Choose Sonoff Dongle Lite MG21 only if price matters more to you than the broader advantage from Smlight SLZB-MR2. As a general recommendation, Smlight SLZB-MR2 comes out on top.

Winner

Smlight

Smlight SLZB-MR2

$102.99

BUY NOW

Sonoff

Sonoff Dongle Lite MG21

$19.90

BUY NOW

Feature	Smlight SLZB-MR2	Sonoff Dongle Lite MG21	Winner
Price	$102.99	$19.90	Sonoff Dongle Lite MG21
Rating	4.8	4.7	Smlight SLZB-MR2
Power	USB, PoE	USB	Smlight SLZB-MR2
Connectivity	USB, Ethernet, 2.4 GHz Wifi	USB	Smlight SLZB-MR2
Antenna Gain	+5dBi	+3dBi	Smlight SLZB-MR2
Dual Network	YES	NO	Smlight SLZB-MR2
Bluetooth Proxy	YES	NO	Smlight SLZB-MR2
Zigbee Chip Model	EFR32MG21 / CC2652P	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

Winner

Smlight

Smlight SLZB-MR2

$102.99

BUY NOW

+ Rating: 4.8
+ Power: USB, PoE
+ Connectivity: USB, Ethernet, 2.4 GHz Wifi
- Price: $102.99 vs $19.90

Sonoff

Sonoff Dongle Lite MG21

$19.90

BUY NOW

+ Price: $19.90
- Rating: 4.7 vs 4.8
- Power: USB vs USB, PoE

Frequently Asked Questions (FAQ)

Which is better overall: Smlight SLZB-MR2 or Sonoff Dongle Lite MG21?: Smlight SLZB-MR2 has the stronger overall profile in this comparison, especially for rating, power, and connectivity.
What is the biggest difference between Smlight SLZB-MR2 and Sonoff Dongle Lite MG21?: Price is one of the clearest differences: Smlight SLZB-MR2 lists $102.99, while Sonoff Dongle Lite MG21 lists $19.90.
Which one looks better on price?: Smlight SLZB-MR2 is listed at $102.99, while Sonoff Dongle Lite MG21 is listed at $19.90. Sonoff Dongle Lite MG21 (better spec).
Who should buy Smlight SLZB-MR2?: Choose Smlight SLZB-MR2 if your priority is rating and power and that matters more than price.
Who should buy Sonoff Dongle Lite MG21?: Choose Sonoff Dongle Lite MG21 if your priority is price and that matters more than rating.

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