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Purchased a home built in 1999 and it has several of these things on the wall that are part of an ADEMCO-made security system.

Can you identify what the purpose of these devices? The yellow light appears to blink when any one of doors in the room opens or shuts.

photo of wall mounted device

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This is a glass impact/break sensor. It is wall mounted and hard wired back to the control panel. It detects impact and actual glass breaking up to about 30 feet.

Per @Menace, clap your hands near them and they should light up.

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    Clap your hands near them and they should light up
    – Menace
    Commented Aug 10, 2019 at 23:36
  • @Menace Whoa, air pressure sensing! That explains why the yellow light would light when opening or closing the door but not consistently.
    – whiskeychief
    Commented Aug 11, 2019 at 11:45

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