A moldable protective cushion for a vehicle door, having a central portion, a first end and a second end, and a receiving groove or aperture having a first moldable wall and a second moldable wall. In a monitoring system for monitoring a house as a monitor area, sensors are placed at appropriate points in the house, and a door open hindrance unit for hindering opening of a front door placed at the entrance of the house is placed. In response to a malfunction in the communication through the backup port, the node communicates with a second network.