Energy Harvesting
The Lightning Switch transmitter requires no outside source of electricity. Each time the transmitter button is pressed, the transmitter converts the mechanical energy supplied by the user's finger into electricity to power a radio transmission to a receiver/relay through the use of a piezoelectric generator (brand name: Lightning) originally invented by the National Aeronautics and Space Administration. This technology is described in the 2005 issue of NASA Spinoff magazine.
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