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The transponder is made up of an electronic microchip engraved in silicon (containing a code number unique to that animal), a condenser, a coil serving as an antenna, all encased in a tiny glass cylinder (approximately 13 x 2 mm) implanted under the animal's skin.
This tiny capsule is made of highly resistant glass (that cannot break inside the animal), which is biocompatible (therefore perfectly tolerated by the animal).
The transponder implanted under the animal's skin is totally passive (inert).
The transponder implanted under the animals' skin is completely inert and thus has no energy. When stimulated by a scanner (which emits low-frequency radio waves – 134.2KHz), it is 'activated' and becomes active (in fact, the transponder uses the energy from the scanner this is known as induction technique).
In turn, the transponder sends back a radio wave sensed by the scanner which displays the number in the microchip on a liquid-crystal screen The whole process last only a few tens of milliseconds!
The scanner interprets the signal by converting binary data into decimal data (or another format) and a code can then be read for example on the scanner or a computer screen