Smlight SLZB-06 vs Sonoff Dongle Lite MG21

For placement flexibility and range the Smlight SLZB-06 is the better dongle, since it connects over Ethernet, PoE and Wi-Fi and uses a +5dBi antenna instead of a USB-only +3dBi design. The Sonoff Dongle Lite MG21 is cheaper and better-rated, so it is the smarter pick if you want a dependable budget USB coordinator.

How they connect. The SLZB-06 is a network coordinator (Ethernet, PoE, Wi-Fi and USB) with a Bluetooth proxy and a +5dBi antenna, while the Dongle Lite MG21 is a USB-only stick with a +3dBi antenna. Both are Zigbee 3.0 coordinators for Home Assistant that can also run Thread; neither does Z-Wave.

The Smlight SLZB-06 has the edge on paper with its +5dBi antenna and central Ethernet or PoE placement, letting it sit closer to your devices and away from server interference. The Sonoff Dongle Lite MG21 uses a +3dBi antenna and a bundled USB extension cable to reduce interference, which owners find covers most homes well.

Buy the Smlight SLZB-06 if you want to place your Zigbee coordinator centrally over Ethernet or PoE for maximum range and stability, with Thread and Bluetooth proxy support. It is the choice when network placement matters more than saving a few dollars.

Buy the Sonoff Dongle Lite MG21 if you want the most affordable, well-rated way into a local Zigbee smart home. It is a compact, nearly plug-and-play USB coordinator (flashable for Thread) that ships with a USB extension cable, ideal for a first build or adding cheap Zigbee routers.