FMB125
The Teltonika FMB125 is a professional 2G GPS tracker with dual SIM, RS232/RS485 serial interfaces, Bluetooth 4.0 and 1-Wire temperature monitoring. Ideal for heavy duty fleets, refrigerated transport and international logistics. Official Teltonika distributor — UK stock, fast dispatch from London.
Teltonika FMB125 — Professional Dual SIM GPS Tracker with RS232/RS485
The Teltonika FMB125 is a professional-grade GPS tracker built for demanding fleet applications that go beyond basic vehicle tracking. With dual SIM support, RS232 and RS485 serial interfaces, Bluetooth 4.0 and a 1-Wire temperature monitoring interface, it's the go-to choice for heavy duty transport operators, refrigerated fleet managers and international logistics businesses across the UK.
As an official Teltonika distributor in the UK, Tracking Hardware UK ships the FMB125 directly from our London warehouse — with volume pricing available for telematics service providers and fleet operators.
Key Features
Dual SIM — automatic failover between two SIM cards, significantly reducing roaming costs for international fleets.
RS232 and RS485 interfaces — connect digital fuel level sensors, Garmin navigation, RFID readers, barcode scanners and more.
1-Wire interface — ideal for refrigerated transport, enabling direct temperature and humidity monitoring.
External GNSS antenna — extends mounting options in vehicles where internal antenna placement is difficult.
Bluetooth 4.0 — connects to BLE sensors and supports wireless OBD2 diagnostics.
Backup battery — 170mAh Li-ion keeps tracking active if vehicle power is cut.
CAN bus compatible — works with Teltonika CAN adapters for deep vehicle data from agriculture, construction and mining equipment.
Jamming detection — alerts when GPS signal interference is detected.
128MB internal memory — stores up to 422,400 records when out of GSM coverage.
Overvoltage protection — safe for use across a wide range of vehicle electrical systems.
Typical Use Cases
Ideal for heavy duty transport, refrigerated vehicles requiring cold chain temperature compliance, international logistics with cross-border roaming, fuel management with LLS sensors, agriculture and construction machinery, and driver identification with iButton or RFID.
Frequently Asked Questions
What is the difference between the FMB125 and FMB920?
The FMB125 is a professional-grade tracker for advanced fleet applications. It adds dual SIM, RS232/RS485 serial interfaces, an external GNSS antenna and 1-Wire temperature monitoring — features not on the basic FMB920. Choose the FMB125 if you need to connect third-party sensors, reduce roaming costs, or monitor refrigerated vehicles.
What devices can I connect via RS232 and RS485?
You can connect digital fuel level sensors, Garmin navigation devices, RFID readers, barcode scanners and other third-party serial devices. This makes the FMB125 ideal for fleets that need data beyond basic GPS location.
Can the FMB125 monitor temperature in refrigerated vehicles?
Yes. The 1-Wire interface connects directly to temperature sensors, making it an excellent choice for cold chain compliance. Temperature data is logged and transmitted alongside location data.
How does the dual SIM work?
The FMB125 holds two SIM cards simultaneously. If the primary SIM loses signal it automatically switches to the secondary, ensuring continuous connectivity. This is especially valuable for international fleets where using a local SIM can significantly cut roaming costs.
Can I buy in bulk?
Yes — we supply telematics service providers, fleet operators and resellers across the UK. Volume pricing and trade accounts are available. Contact us for a bulk quote.