Smlight SLZB-06p7U vs Sonoff Dongle Lite MG21

The Smlight SLZB-06p7U is the more capable dongle, adding Ethernet, PoE and Wi-Fi placement, a +5dBi antenna and a Bluetooth proxy. The Sonoff Dongle Lite MG21 is a cheaper USB-only stick with a +3dBi antenna, so it is the value choice for a simple, dependable coordinator.

Connectivity. The SLZB-06p7U is a network coordinator (Ethernet, PoE, Wi-Fi and USB) with a Bluetooth proxy and USB-over-Ethernet, while the Dongle Lite MG21 is a USB-only stick. Both are Zigbee 3.0 coordinators for Home Assistant that also run Thread; neither supports Z-Wave.

The Smlight SLZB-06p7U has the edge with its +5dBi antenna and the option to place it centrally over Ethernet or PoE, closer to your devices. The Sonoff Dongle Lite MG21 uses a +3dBi antenna and a bundled USB extension cable to reduce interference, which owners find covers most homes fine.

Buy the Smlight SLZB-06p7U if you want to mount your Zigbee coordinator centrally over Ethernet or PoE for better range and stability, with a Bluetooth proxy and Thread border router in the same unit. It is the choice when placement and features outweigh price.

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