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What is a passive tag?

Passive tags contain no internal power source, unlike active tags which depend on batteries with a typical lifespan of three to five years. They are externally powered and typically derive their power from the carrier signal emitted by the reader. Passive tags typically cost less and have fewer failure modes because they contain fewer components and connections. They can operate across a wider temperature range. Also, they typically have a longer life expectancy because there is no internal battery. 
All TROVAN transponders are passive.