https://www.futureelectronics.com/m/melexis . Discover the first Induxis® switch, an inductive switch that fully integrates the coils. Contact-less, magnet-less, and stray field immune, this solution simply detects any conductive target (e.g. metal). It is ideal for safety applications in the area of electrification. https://youtu.be/ilXKkf_K30U