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PART · Add-on · 4G / LTECellular modem module for SMLIGHT hubs2026·07
Add-on module · 4G / LTE

4G add-on.
Internet, anywhere.

A cellular modem module that gives your SMHUB or SLZB-Ultima its own internet — as the primary link, or as automatic backup that takes over the moment the broadband drops. Drop in a SIM and your smart home stays online.

Where to buyExplore ↓
SMLIGHT add-on modules, including the 4G / LTE modem
LTE Cat-1 · GSM fallbackSIM slot · click-in
01

Fits these.

Add-on module
Sold separately

A click-in cellular modem — optional, not part of the base bundle.

Hub
SMHUB →
Give the Linux hub a wired-free internet link or a failover WAN.
Hub
SLZB-Ultima →
Keep the flagship coordinator online independently of your router.
Hub
USB-Extender →
Add cellular internet to a laptop or coordinator over the powered USB hub.
02

Specifics.

4G / LTE module
CellularLTE Cat-1 with 2G/GSM fallback
SIMStandard SIM slot
RolePrimary WAN or automatic backup
InstallKeyed click-in header
03

Quick questions.

Straight answers
No footnotes
Q-01
Can it be a backup connection?
Yes — a common setup is broadband first, 4G as automatic failover so nothing goes dark when the line drops.
Q-02
Is a SIM included?
No. Add any data SIM from your carrier of choice.
04

Where to get it.

Worldwide
Distributor network

The 4G / LTE add-on ships worldwide through our distributor network. Buying in volume? Our sales team is one email away.

Where to buy →Email sales
Add-on · 4G / LTE · Cellular modem module for SMLIGHT hubs · 2026·07smlight.tech/products/addon-4g · SMLIGHT