Wireless device in pair?

I want to buy or make a wireless device that works in pair. When they are near or in range it should be ON and when they are out of range its should be OFF. 

Purpose:

I want to installed wireless security to my car. I will install 1 piece in my car and the other one will be in my pocket like keychain. I hope i have explain properly what i want.

Sorry for bad english.

1 Answer

Relevance
  • 4 weeks ago

    This does not make sense.  If you are out of range of your car, the device should turn off?   You want security only when you are near it?  

    • Marvinator
      Lv 7
      4 weeks agoReport

      that is exactly what the new cars do.  That fob device will not allow the car to start when it's not in the car.  

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