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Door/window contact system

  • US 9,361,773 B2
  • Filed: 02/13/2015
  • Issued: 06/07/2016
  • Est. Priority Date: 12/04/2012
  • Status: Active Grant
First Claim
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1. A position detector comprising:

  • a first element having an attachment feature, the first element emitting a unique, identifying radio frequency signal in response to a received, enabling radio frequency signal wherein the first element further comprises an RFID-type tag; and

    a second element with a transmitter that emits the enabling radio frequency signal, and that emits a reporting radio frequency signal, wherein both the enabling radio frequency and reporting radio frequency signals are emitted by the same transmitter, and wherein power is optimized to improve battery life by only transmitting what the first element requires for the identifying radio frequency signal to be emitted.

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