Tracker droid

A Tracker droid was a type of Seeker droid; it could be attached or placed on a moving target, and it would then transmit its current location. For practical purposes they were of tiny size and could move around.

Some such tracker droids were animal-shaped, moved on their own, and transmitted some audio signal to their user (via a comm unit) according to their distance from the target; the frequency and volume of clicks would increase by proximity, and became unbroken once the user approached the target.

Text and facts from the “Tracker droid” article on Wookieepedia, licensed under CC BY-SA 3.0. Modified for this site.