• Terrestrial

Drop-off Mechanism for Lotek Collars

  • Product Type Icon Accessory

Timer and Radio Release Mechanisms

Capturing and recapturing for collar deployment is a stressful event for the animals and costly endeavour for the biologists. Lotek’s drop off solutions are designed to reduce the cost associated with recapture, as well as the stress on the animal. The choices offered can cover deployment on a multiple array of species. The weights of drop offs vary from 10g – 121g. The release principles include timer countdown, radio command for release up to 5 years, and release by Iridium command. Contact your Telemetry Specialist to discuss suitability of dropoff model for your study goals.


  • Choice of 3 drop-off mechanisms:
    TRD (Timed release device) drop off by timer countdown
    TRRD (Timed radio release device) drop off by timer or radio command
    TRRD-VHF (Timed radio release device) timer, radio or Iridium command
    On-demand triggering allows full control of release location.
    Units equipped with radio are also equipped with timer as a backup.
  • Either send existing collars to Lotek to be retrofitted, or do it yourself.
  • Compatible with most Lotek GPS and VHF collars.
  • Product Applications

    Long battery life: Units may be released on command or set for release up to 60 months from moment of deployment.

  • Links and Resources

    Collared Deer

    Mule Deer

    Black Tailed Doe

    Keeping it Wild: Pronghorn Tracking Collars

    SloCo Expedition to La Selva for GPS Collaring and Sample Collection
    La Selva Sloths | Retrieving the GPS Collars – SloCo (slothconservation.org)

    Polar bear body cams capture never before seen behavior from Arctic predator

    Elk Camera Collar

  • Product Specifications

    Weight (g) [1] 10 16 30 40 121
    Size (LxWxH) (mm) 28 x 15 x 12.5 30 x 15 x 16.5 32 x 30 x 22 32 x 30 x 22 61 x 41 x 25
    Life (months) 12 12 60 60 60
    Time resolution [2] Set days, 365 max. Set days, 365 max. 1 week increments 1 week increments 1 week increments
    Time programming [3] At Lotek only At Lotek only At Lotek only At Lotek only At Lotek only
    Operating distance [4] <400m
    Tensile strength (kg) 10 ~60 30 400 400

    1. Weight does not include mounting hardware.
    2. Activation by relative time function (not absolute time) is initiated by a magnet.
    3. Once a time is programmed into the mechanism at Lotek, it cannot be changed unless the electronics are replaced.
    4. Operating distance in line of sight OR via Iridium command for TRRD-VHF.

    Features and specifications subject to change without notice.

    Technical specifications:
    Operating temperature range:
    Micro-TRD and Mini-TRD: -10˚C to +50˚C
    TRD-L/TRD and TRRD/TRRD-VHF: -30˚C to +50˚C

  • Product Downloads

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