For studying intra- and interspecies interactions, we offer small, energy-efficient, and economical UHF-ID tags. These ID tags can be deployed to any kind of collar or they can be integrated into a VERTEX Plus collar. It can be equipped with several sensors and a VHF beacon transmitter. Depending on the application, different data is transmitted between the ID tag and the VERTEX Plus collar. The ID tag’s signal is received and recorded using the UHF data communication in a VERTEX Plus collar. The maximum range is about 130 meters but the IDs signal output can be adjusted to the needs of your study.

  • Housing: flexible
    picture shows VERTEX Plus 1C battery housing with (L)70mm x (D)25mm x (H)45mm
  • Weight: >120 g
  • Lifetime: 18 – 36 months
    depending on the battery size and configuration
  • VHF beacon:
    • VHF frequency: 130 – 400 MHz (factory setting)
    • Output Power: +10 dBm
    • Pulse Length: 12 ms

One possible design for a UHF-ID Tag. Housing with battery and electronic and belting is customizable.
One possible design for a UHF-ID Tag. Housing with battery and electronic and belting is customizable.
To get a first impression of our UHF-ID Tags, have a look at the short video introduction of the External Sensors:

UHF-ID Tag: Separation Sensor Application

The Separation Sensor Application has been developed to study mother-offspring behaviour, but it can also be a useful tool for monitoring inter-group dynamics. With the Separation Sensor Application, the VERTEX Plus collar is able to monitor signals from up to eight UHF-ID tags. The VERTEX Plus collar listens to the UHF-ID tags in pre-defined intervals. If an ID tag signal has not been received for one hour, the VERTEX Plus collar stores a separation event and optionally sends a message via GSM or Iridium. The tag’s signal does not only contain the ID, but also the information if the tagged animal is dead or alive. This information (mortality event) is automatically sent to the collar, independent of the communication schedule.

Seperation Sensor Application
The UHF-ID Tag: Separation Sensor Application

  • observes the activity and detects the death of the ID-tagged animal.
  • sends its ID with status (death or alive) to the GPS collar.
  • VHF Beacon switches to mortality signal in case of death of the animal.

The GPS collar

  • stores the present/absent status for each measurement point.
  • sends a present/absent list with each GPS transmission (GSM & IRIDIUM) including the status (dead or alive).
  • sends an emergency signal with mortality message (optional).


  • Mother-Offspring Behaviour: When does the mother start to leave the offspring? How long is she gone? What happens when the fawn dies?
  • Inter Group Dynamics: Are the group members always in the vicinity of each other? Do they separate? If they do, how long do they separate? How does the group react to the death of a member?
The Expandable Fawn Collar has been designed for attaching a UHF-ID tag on a fawn. This collar is very light and made of elastic material which is folded in several layers. The layers are sewed together with cotton yarns, which allow the layers to unfold with the effect from wear, time and weather. The combination of elastic and folded material ensures a good fit for a growing neck of the fawn.
  • Housing: 33 mm x 31 mm x 25 mm
  • Belt Width: 30 mm
  • Belt Size: depending on customer’s specifications
  • Weight: 56 g (with a belt size of 24 cm – 33 cm)
  • Lifetime: 10 to 26 months, depending on the configuration

UHF ID Tag: Proximity Sensor Application

The Proximity Sensor is part of each VERTEX Plus collar with UHF communication. It receives signals from UHF ID tags (e.g. on prey animals) and then

  • stores the UHF ID with time stamp and signal strength,
  • transmits the IDs via GSM or Iridium (optional),
  • automatically switches to an alternative GPS schedule for as long as UHF ID is received (optional).

The Proximity Sensor helps you to study interactions between individuals – either conspecifics, competitors or predator-prey-relationships. Find out which animals interact with each other, at which times, and how long. To get a first impression, have a look at our video introduction:


  • Predator-Prey Interaction: How often are predators in the vicinity of prey individuals? How often does a predator return to its kill and how long does it stay there?
  • Human-Animal Conflict: Are predators in the proximity of potential prey and how do they behave in these situations? Check if your study animal really is a threat for livestock or how their movement is related to their prey.
  • Individual Interactions: Find out which individuals of a population interact with each other, increase GPS fixes during times of encounter and thus get exact information on movement and activity patterns.
  • Competition: Monitor which animals use the same area and if they encounter each other on a regular basis.
  • Epidemiology: Study the contact pattern of individuals and thus the spreading pattern of pathogens.

A subsumed version of these features you find here in our Flyer: PDF External Sensors