Overview

FMB125 is a dual-SIM tracker with an external GNSS antenna, internal GSM antenna, Bluetooth connectivity and a backup battery. It is built for communication with third-party RS232 and RS485 devices, such as digital fuel sensors, RFID readers and navigation systems, and includes a 1-Wire interface for temperature monitoring — making it well suited to refrigerated transport. With Teltonika CAN adapters, it also extends into agriculture, construction and mining applications.

Key Features

Dual SIM support to significantly reduce roaming costs
RS232 and RS485 serial interfaces for third-party device integration
1-Wire interface for temperature sensors and RFID/iButton tags
External GNSS antenna (SMA) for flexible mounting, internal antenna optional
Bluetooth 4.0 + LE for sensors, headsets, OBDII dongles and barcode scanners
CAN adapter input for agriculture, construction & mining integrations
Integrated backup battery keeps the device working without external power
Multiple sleep modes: GPS Sleep, Online Deep Sleep, Deep Sleep, Ultra Deep Sleep
Accelerometer-based crash, towing and unplug detection
Auto and manual geofencing
Green driving, over-speeding and excessive idling detection
Immobilizer and DOUT control via call, SMS or GPRS
Jamming detection
GNSS fuel counter plus LLS/RS232/RS485 fuel sensor support
OTA firmware & configuration updates (FOTA, USB/Bluetooth configurator, FMBT app)
128 MB internal flash memory

Applications

Light vehicles
Heavy duty transport
Trailer tracking
Refrigerated transport
International logistics
Car sharing

Specifications

GNSS

Spec	Value
Receiver	33 channel
Tracking sensitivity	-165 dBm
Position accuracy	< 2.5 CEP
Velocity accuracy	< 0.1 m/s (within ±15% error)
Hot start	< 1 s
Warm start	< 25 s
Cold start	< 35 s
Systems	GPS, GLONASS, Galileo, BeiDou, SBAS, QZSS, DGPS, AGPS

GSM / Connectivity

Spec	Value
Bands	Quad-band 850/900/1800/1900 MHz
Data transfer	GPRS Multi-Slot Class 12 (up to 240 kbps)
GPRS mobile station	Class B
Data support	SMS (text/data)
SIM	Dual SIM

Bluetooth

Spec	Value
Specification	4.0 + LE
Supported peripherals	Temperature & humidity sensor, headset, OBDII dongle, barcode scanner, universal BLE sensors

Interface & Hardware

Spec	Value
Digital input	1
Digital output	1
Analog input	1
CAN adapter input	1
1-Wire	1
RS232 / RS485	1 / 1
USB	2.0 Micro-USB
Status LEDs	2
Storage	128 MB internal flash memory
GNSS antenna	External (SMA connector), internal optional
Cellular antenna	Internal high-gain

Power

Spec	Value
Supply voltage	10–30 V DC, overvoltage protected
Backup battery	170 mAh Li-Ion, 3.7 V (0.63 Wh)
Ultra Deep Sleep	< 6 mA @ 12V
Deep Sleep	< 6.5 mA @ 12V
Online Deep Sleep	< 7 mA @ 12V
GPS Sleep	< 12 mA @ 12V
Nominal (no load)	< 38 mA @ 12V