The SMLIGHT SLZB-MR4U is a multi-protocol LAN/Wi-Fi/USB gateway offering Zigbee 3.0 coordinator/router functionality and Thread (Matter over Thread) support in a single compact device. With +20 dBm transmission power and a high-gain external antenna (~+5 dBi), it enables stable, long-range mesh networks – making it an ideal choice for home and semi-professional smart home installations.
The SLZB-MR4U can operate via Ethernet (PoE 48 V), Wi-Fi, or USB, and allows seamless mode switching between Zigbee coordinator/router and Thread using the built-in web interface. The SLZB-OS operating system offers extras such as remote OTA updates, IEEE address change, script support, and secure VPN access.
Highly recommended for Home Assistant (ZHA/Zigbee2MQTT/OpenThread) systems and Matter-compatible ecosystems. It provides a future-proof, cloud-independent solution where fast migration and stable local control are essential.
The “U” edition is the upgraded version of the SLZB-MR4U: it adds hardware flow control for both radio SoCs, software-controllable RJ45 LEDs, and USB mode exposing both radios as separate USB-serial devices. It also supports USB passthrough (USB-over-IP), enabling remote use of USB radios (e.g. ZWA-2) over the network.
About SMLIGHT
SMLIGHT develops multi-protocol Zigbee/Thread gateways and LAN/PoE adapters for both DIY and professional users. Their products focus on local, reliable operation and compatibility with open ecosystems like Home Assistant, Zigbee2MQTT, OpenThread, and Matter.
Key Product Features
- Zigbee & Thread in one device: Zigbee 3.0 coordinator/router with Matter-over-Thread support.
- Flexible connectivity: use over Ethernet (PoE 48 V), Wi-Fi, or USB; switch modes via web UI or physical button.
- High radio performance: +20 dBm TX power and ~+5 dBi antenna for better signal quality and range.
- SLZB-OS extras: OTA updates for Zigbee/Thread chips, IEEE address changing, scripting/automation, secure VPN access.
- Home Assistant compatibility: ZHA, Zigbee2MQTT, and OpenThread Border Router integrations.
- Compact, install-friendly form: mountable on wall/screws or with double-sided adhesive; 3D-printed mounts available.
Smart Home Protocols & Platform Compatibility
- Supported protocols: Zigbee 3.0 (coordinator/router), Thread (Matter over Thread).
- Platforms: Home Assistant (ZHA, Zigbee2MQTT, OpenThread), Matter-compatible systems via Thread.
- Local operation: stable control over LAN without the cloud; built-in web interface.
- Advanced features: one-click mode switching, IEEE address modification, VPN access for remote environments.
Smart Features
- Quick setup & migration: pre-flashed firmware with one-click Zigbee/Thread switching.
- OTA updates: remote firmware updates for both Zigbee/Thread radios and the ESP-based system.
- Scripting & automation: built-in SLZB-OS script support for complex tasks.
- LED indicators & button: multiple status LEDs and a physical button for quick interaction and mode switching.
Technical Specifications
- Product: SMLIGHT SLZB-MR4U (Zigbee/Thread LAN/Wi-Fi/USB gateway)
- Radio SoC: Texas Instruments CC2674P (Zigbee/Thread) with high-gain RF stage
- Controller & Interface: ESP32 (dual-core, 240 MHz); Microchip LAN8720 Ethernet; CP2102 USB–UART bridge
- Wireless performance: ~+20 dBm TX power; external ~+5 dBi antenna (adjustable)
- Network connectivity: Ethernet (RJ45) with PoE 802.3af 48 V support; Wi-Fi; USB (data & power)
- Operating modes: Zigbee 3.0 Coordinator / Zigbee Router / Matter-over-Thread – switchable via web UI
- Software: SLZB-OS (web UI, password protection, OTA, scripting, VPN, LED management)
- Installation: wall/screw or double-sided adhesive; compact housing with rotatable antenna
- Accessories: high-gain external antenna; quick installation guide included
