SMLIGHT SLZB-Ultima Review: Zigbee, Thread, Z-Wave and Bluetooth in One Four-Antenna Gateway
The SLZB-Ultima puts a Silicon Labs and a Texas Instruments Zigbee radio, a Z-Wave Series 800 controller, a Thread border router, a Bluetooth proxy and USB over Ethernet in one device with four external antennas. Dual network mode lets Zigbee and Thread run together, and the gateway connects over Ethernet with PoE, USB or 2.4 GHz Wi-Fi. It suits a Home Assistant or Zigbee2MQTT home that runs several protocols and wants one well-placed gateway instead of a pile of dongles, with the trade-off that one device then carries all of them.
- Consolidating every radio into one device
- Mixed Zigbee, Z-Wave and Thread homes
- PoE installations
- Large Home Assistant setups
Pros
- Zigbee, Thread, Z-Wave and Bluetooth in one device
- Silicon Labs and Texas Instruments Zigbee radios
- Z-Wave Series 800 controller
- Dual network mode for Zigbee and Thread together
- USB over Ethernet support
- Four external antennas
- Ethernet with PoE, plus USB power and 2.4 GHz Wi-Fi
- Home Assistant and Zigbee2MQTT support
Cons
- One device carries every protocol, so a failure affects all of them
- Chip models, transmit power, antenna gain and dimensions are not published
- No Matter bridging of existing Zigbee or Z-Wave devices
- Wi-Fi is 2.4 GHz only
- One year warranty
Who is the SLZB-Ultima for?
It targets a setup that has accumulated hardware: a Zigbee coordinator, a Z-Wave stick and a Bluetooth adapter, maybe a spare dongle shared over the network. This gateway covers all of it, and PoE lets the whole radio stack sit in one central spot on a single cable instead of behind a server in a cupboard. Four external antennas show the intent: reception across several protocols at once.
What stands out on paper
Zigbee 3.0 with coordinator and router roles runs on Silicon Labs and Texas Instruments silicon, with dual network mode so Zigbee and Thread operate at the same time and a Thread border router role for Matter accessories. A Z-Wave Series 800 controller covers the current Z-Wave generation. A Bluetooth proxy relays Bluetooth sensors to Home Assistant, and USB over Ethernet exposes another USB device plugged into the gateway as though it were attached to your server. Connection is Ethernet, USB or 2.4 GHz Wi-Fi, power comes from PoE or USB, and both Home Assistant and Zigbee2MQTT are supported.
What to know before you buy
Putting every protocol in one box means one failure affects all of them, so a spare coordinator at hand is a sensible precaution. The exact chip models, transmit power, antenna gain, size and weight are not published in the spec sheet. It does not bridge Zigbee or Z-Wave devices into Matter. Wi-Fi is limited to 2.4 GHz, so the wired connection is the better choice, and the warranty is one year.
Is the SLZB-Ultima worth it?
The case for it is consolidation: if you would otherwise buy a multi-radio Zigbee gateway, a Z-Wave controller and a Bluetooth solution, one device is tidier and better placed. If you only use one protocol, a single-radio coordinator does the daily job. It is a specialist network device, so expect to spend time on firmware and integration setup.
Frequently asked questions
Which protocols does the SLZB-Ultima handle?
Zigbee 3.0, Thread as a border router, Z-Wave Series 800 as a controller, and Bluetooth through a proxy function. It also supports USB over Ethernet.
Can it run Zigbee and Thread at the same time?
Yes. Dual network mode is supported.
How does it connect and get power?
It connects over Ethernet, USB or 2.4 GHz Wi-Fi, and it can be powered through PoE or USB.
Does it work with Home Assistant and Zigbee2MQTT?
Yes, both are supported.
Does it bridge Zigbee or Z-Wave devices to Matter?
No. It works as a Thread border router, but it does not bridge existing Zigbee or Z-Wave devices into Matter.
