Which innovative product design feature revolutionized wildlife tracking collars in the 2010s, significantly extending battery life while reducing collar weight by over 60%?

Conservation products are continuously evolving to better protect and monitor endangered species. The design of these products must balance effectiveness, animal welfare, durability in harsh environments, and technological innovation. Test your knowledge about a revolutionary tracking device that changed wildlife conservation practices!

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Solar-powered microprocessors with sleep-mode algorithms that activate only when animal movement is detected
Bluetooth-enabled GPS systems that offload data to nearby receivers, eliminating constant satellite transmission
Kinetic energy converters that harvest energy from the animal's movement to recharge batteries
Biodegradable graphene circuits that require minimal power while providing enhanced signal strength