SMLIGHT SLZB-MR3U is the latest generation multi-radio smart home coordinator that integrates two powerful SoCs - Texas Instruments CC2674P10 and Silicon Labs EFR32MG24 - into a compact device, thus providing full support for Zigbee and Thread (including Matter-over-Thread) protocols at the same time. For maximum flexibility, it works seamlessly with Zigbee2MQTT, ZHA, Matter ecosystems and Home Assistant, without vendor restrictions. This makes it an ideal choice for advanced home automation and the integration of open source platforms.

It comes with a pre-installed SLZB-OS operating system, thanks to which it is ready to use immediately, including a web interface, OTA update, VPN, secure access and automation options. In a compact size, placed in a solid ABS housing, equipped with ventilation openings and separate antenna connectors, it provides a modern and durable solution.

The "U" edition is an improved version of the SLZB-MR3U: it adds hardware process control to both radios' SoCs, software-controlled RJ45 LEDs, and USB mode allows both radios to appear as separate USB serial devices. Furthermore, the USB-passthrough (USB-over-IP) function is supported, so that USB radios (e.g. ZWA-2) can also be used over a network.

Main product features

- Dual-radio architecture equipped with CC2674P10 and EFR32MG24 chips, enabling simultaneous operation of Zigbee 3.0 and Thread (Matter-over-Thread).
- +20 dBm TX power, high radiation strength, with built-in PA amplifiers for both radios.
- Multiple connection and recording options support Ethernet (with PoE), USB-C (power and data) and Wi-Fi; robust ABS housing with multiple mounting options (wall/DIN-rail/adhesive).
- OTA firmware updates and web dashboard can be updated via both radio SoC and SLZB-OS browser; VPN, scripts, network settings, multilingual UI, LED indicators and mode switch button are included.
- Powerful antenna system with two external SMA antennas, supplemented by an integrated PCB antenna, which ensures excellent signal strength and stability.
- Multi-protocol gateway: Zigbee 3.0 coordinator + Thread Border Router in one, with Matter-over-Thread support.
- Extra functions of the "U" edition: HW flow control for both radios; software control of RJ45 LEDs; In USB mode, two separate USB serial ports (CC and EFR radio separately).
- USB-passthrough (USB-over-IP): transmission of USB devices (e.g. Z-Wave stick) via Ethernet as a remote serial port.

Smart home protocols and platform compatibility

- Supported protocols Zigbee 3.0, Thread (Matter-over-Thread), Wi-Fi, Bluetooth.
- Platform compatibility fully compatible with Zigbee2MQTT, ZHA, Home Assistant and Matter-over-Thread ecosystems.
- Vendor-agnostic design, no ecosystem constraints, free integration options.
- Home Assistant integration is supported in SLZB integration from Home Assistant version 2025.06.

Smart functions

- Management of Zigbee and Thread networks (Matter-over-Thread) in a single device, with simultaneous or switchable modes.
- Remote OTA updates and management via web dashboard without physical access.
- Secure administration with VPN support and encrypted communication options.
- Multiple LED indicators and mode switch buttons for real-time feedback and control.
- USB-over-IP: sharing USB radios (e.g. Z-Wave) over IP, as if it were a local USB.
- Advanced diagnostics: separate status LEDs per radio; HW flow control ensures stable frame transmission (Prevents buffer overflow: if the receiving party cannot read fast enough, it "requests a break" with CTS/RTS signals, so no frames are lost (Zigbee/Thread packets)).
- USB dual CDC: when connected to a computer, two USB serial ports appear (separate for CC and EFR).

Electrical and hardware specifications

- Power supply 48 V PoE (802.3af) or 5 V USB-C.
- Maximum consumption approx. 1.5 W when both radios are active.
- Housing compact ABS housing with ventilation holes, can be attached to a wall, DIN rail or with glue.
- Indicators and control Six LED status indicators and a multi-function button for mode change/reset.

Other features

- Compact and future-proof design, which is suitable for both DIY users and professional systems preparing for Matter.
- Comes with an accessory installation kit (antennas and mounting accessories for quick installation).
- Excellent performance and network coverage, ideal for larger homes or multi-building systems.