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    About SMLIGHT 4G/LTE Modem Addon

    SMLIGHT 4G/LTE Modem Addon

    Add cellular connectivity to your smart home setup. The SMLIGHT Addon-4G is a compact plug-in module that gives your device a mobile internet connection via 4G LTE. Simply insert a nano-SIM card, plug the module into a compatible SMLIGHT device, and your hub can stay online even without Wi-Fi or a wired network. It works worldwide across major LTE bands, making it ideal for remote locations, backup internet, or installations where running an Ethernet cable isn't practical. The module connects over USB internally — no complex wiring needed.

    ChipsetSIMCom 7672G
    ProtocolUSB 2.0
    Pinout8-pin header
    Addon Size30 x 42 mm

    Key Features

    Plug-and-Play 4G

    Insert a nano-SIM, plug it in, and your device gets mobile internet — no configuration needed.

    Global Coverage

    Supports LTE bands worldwide (FDD & TDD), so it works in virtually any country.

    Up to 10 Mbps

    Fast enough for remote monitoring, cloud sync, MQTT messaging, and firmware updates.

    Backup or Primary Internet

    Use it as your main connection in remote locations, or as a failover when your home network goes down.

    Network Status LED

    A built-in indicator shows connection status at a glance — searching, connected, or transmitting.

    Also Works as a USB Modem

    Plug it into a PC or Raspberry Pi and it works as a standard USB 4G modem.

    Technical Details

    Electrical Specifications

    ParameterMin.Typ.Max.Unit
    Supply Voltage4.755.05.25V
    Supply Current (Peak)——2.0A
    Power Off—0.120.20mA
    Sleep Mode—1.82.5mA
    Idle Mode121625mA
    Data Transfer140190320mA
    Operating Temperature-30+25+80°C
    SMLIGHT 4G/LTE Modem Addon module

    Quick Reference

    Chipset
    SIMCom 7672G
    Protocol
    USB 2.0
    Pinout
    8-pin header
    Addon Size
    30 x 42 mm

    Compatibility

    Works with SMLIGHT devices and external platforms. Standard interfaces make DIY integration straightforward.

    SMLIGHT Devices

    SeriesNotes
    SLZB-Ultima✓Built-in slot
    SLZB-U2L✓Built-in slot
    SMHUB Essential / Premium✓Built-in slot
    SMHUB-Nano✓Via USB-Extender
    SMHUB-NanoMR✓Via USB-Extender
    SLZB-06xU✓Via USB-Extender
    SLZB-MRxU✓Via USB-Extender

    DIY & External Platforms

    PlatformNotes
    ESP32-S3✓USB host capable
    ESP32 (other variants)✕No USB host support
    PC / Laptop✓Works as USB 4G modem
    Raspberry Pi✓Via USB

    Where to buy SMLIGHT Addon 4G

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