It is shaped like a backpack and glued onto the back of a bat or other small animal.
It contains GPS and wireless internet equipment that allow the scientists track the animal's movements.
[1][2] The scientists who invented BATS differentiate it from other systems because it is lighter, requires less power, and can track animals even inside caves or hollow trees.
BATS falls off the animal's back after about fourteen days.
Scientists then collect fallen BATS to reuse the parts.