The SMLIGHT SLZB-MR4U is a multi-protocol LAN/Wi-Fi/USB gateway that offers Zigbee 3.0 coordinator/router functions and Thread support (Matter over Thread) in a compact device. With transmission power over +20 dBm and an external high-gain antenna (~+5 dBi), it allows stable mesh network operation over long distances, making it suitable 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 switching between Zigbee coordinator/router and Thread via a web interface. The SLZB-OS software provides additional features such as remote OTA updates, IEEE address change, scripting support, and secure VPN access.

It is especially recommended for Home Assistant systems (ZHA/Zigbee2MQTT/OpenThread) and Matter-compatible ecosystems. It offers a future-proof solution that does not depend on the cloud, where fast switching and stable local control are critical.

The "U" version is the upgraded version of the SLZB-MR4U: it adds hardware flow control for both radio SoCs, RJ45 indicator lighting controlled via software, and a USB mode that exposes both radios as separate USB-serial devices. It also supports USB passthrough (USB-over-IP), allowing remote use of USB radios (e.g., ZWA-2) over the network.

Key Product Features

• Zigbee & Thread in one device: Zigbee 3.0 coordinator/router with Matter-over-Thread support.
• Flexible connectivity: Use via Ethernet (PoE 48 V), Wi-Fi, or USB; switch functions via web interface 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 change, scripting/automation, secure VPN access.
• Compatibility with Home Assistant: Integrations with ZHA, Zigbee2MQTT, and OpenThread Border Router.
• Compact and installation-friendly form: Wall/screw mountable or with double-sided tape; available 3D printed mounts.

Technical Specifications

• Product: SMLIGHT SLZB-MR4U (Zigbee/Thread LAN/Wi-Fi/USB gateway)
• Radio SoC: Texas Instruments CC2674P (Zigbee/Thread) with high-gain RF amplifier
• 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)
• Networking: Ethernet (RJ45) with PoE 802.3af 48 V support; Wi-Fi; USB (data & power)
• Functions: Zigbee 3.0 Coordinator / Zigbee Router / Matter-over-Thread – switchable via web interface
• Software: SLZB-OS (web interface, password protection, OTA, scripting, VPN, LED management)
• Installation: wall/screw mount or double-sided tape; compact enclosure with adjustable antenna
• Accessories: external high-gain antenna; quick installation guide included