Target species:

  • small and large gulls
  • ducks
  • curlews
  • whimbrells
  • godwits
  • oystercatchers
  • small ibises and herons
  • pertels
  • large cuckoos
  • small raptors
  • large pigeons
  • gamebirds
  • large terns
  • crows, etc……

INTERREX LEGS: 3 solar panels, Internal ring diameter from 9mm, weight from 15g, ‘click’ ring system – snap fit design.

INTERREX COLLARS: 3 solar panels, all Internal diameters possible, a few colour versions and customized codes, ‘click’ system – snap fit design.


2G, 4G and 5G (NB-IoT & LTE-M)* networks are available (depending on version) for this device

INTERREX is a high performance GPS-Cellular-Solar-ACC Tracker suitable for backpack deployment for birds weighing 260 grams and more. It is the upgrade version of LEGO-SMALL and consists of four models at different elevations and starting weight of 8 (+/- 0.1) grams.

Durable structure with injection molded housing with inside solar panel.

Very universal and light device for many species.

* 5G network has been deployed to Europe, North America, Australia, most of Asia and South America, and a few countries in Africa. Click here to check the coverage of 5G service worldwide.
Appearance & Measurement
Dimensions:43 mm × 25 mm × 12 mm | 18 mm | 21 mm | 30 mm
Weight:From 8g
Antenna:Internal ceramic antenna
Housing:Strong and water proof, with multiple harness threading holes. 7 ATM (70 meters under freshwater)
Data Types
GPS:Longitude, latitude, altitude, geoid height, course, satellite quantity
ENV:Voltage, light intensity, temperature
BHV:ODBA (overall dynamic body acceleration)
ACC:x/y/z acceleration data (upon request)
BSS:longitude, latitude, altitude (alternative locating method for extreme situation)
Power Supply
Solar type:GaAs solar unit (30% efficiency) with good performance under weak light
Battery type:Lithium polymer rechargeable battery with under-and-over-charge protection
Battery capacity:30 mAh | 100+ GPS fixings without recharge
GPS Module
GPS precision:CEP (50%) 5m
Max update rate:10 Hz
Transmission Module
GPRS (2G data) | GSM (2G SMS) (global roaming supported)
BLE (Bluetooth Low Energy)
Transmission Rate:2G: Max. 85.6 Kbps/85.6 Kbps (uplink/downlink)
Data Collection & Transmission Setting:
Regular-Interval Mode:
- GPS interval: 5 min ~1 day
- ENV interval: 5 min ~1 day
- ODBA interval: 10 min/30 min
- ACC interval: 25 Hz, 3 seconds in every 10 min (by default)
- Transmission interval: 5 min ~1 day
Above ranges are selectable on website data platform or App. Contact us if other settings are required.
On-Time Mode
- Transmission: Up to three times at fixed hours per day (such as 13:00/14:00/18:00)
- GPS / ENV / BHV: Regular-interval model or on-time model follow each transmission
Sleep Mode
This mode is to deactivate certain type of data collection for:
- a certain period (from minutes to months)
- a regular period each day (a maximum of 16 hours)
Intelligent Frequency Optimization & Flight Detection (BOOST)
The BOOST function intelligently increases data collection & transmission frequency when the charging condition is good or the bird is flying. The default setting is as below:
Frequency Optimization:Every 10 min/1 min
Flight Detection:Every 20 sec
With BOOST, the device portrays detailed movement tracks without manual intervention and avoids the possibility of battery drain due to radical settings in bad weather.
Data Storage
Logged data will be stored in memory if network is unavailable.
Flash memory:16 MB
Regular data storage:380,000 data (460 days of regular data storage)
BOOST data storage:280,000 pieces
ACC data storage:28,700 pieces
Operational Environment
Working temperature:-20°C~60°C
Waterproof:7 ATM (70 meters under freshwater)
Firmware Upgrade
Over the air (OTA)

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