Invisible home automation is perfect home automation. At less than 0.4” in width some might call it small and compact. We prefer to call it invisible. It’s the Z-Wave door sensor that’s been designed as the door sensor should have always been. Powerful but invisible. Recessed Door Sensor is a clever piece of technology that installs simply within your door’s frame. It’s as beautiful as the rest of your home. You never see it; you just feel its benefits.