Im not talking about this thing opening doors when it senses players. I know I can use onPlayerTouch events, or zone bricks, I loving KNOW, I just want a custom brick/prop.
the little sensors for a store / hotel door that open doors automatically when someone steps into range of the sensor. make it like, 2 plates high.

make the parts sticking out transparent gray or something and have a red light thingy behind the big piece.