Battery-free TPMS
The latest vehicles use a TPMS system without any little batteries in the sensors - it relies on the centrifugal action for energy. Do any of the aftermarket TPMS systems for trailers use this tech...
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And personal jet packs are probably in the future too, but sometimes simple works very well. A small battery that last a couple years versus the rather convoluted query/response type necessary for the SAW system to work. KISS.
