Furthermore, the company offers a landline option along with cellular and broadband, which can be a great backup when needed. On the other hand, the least expensive Protect America plans actually do require a landline, which some customers may find annoying. In theory, motion sensors are just waves bouncing off a target detecting movement. However, in reality, they give property owners a heads up. They may be integrated as a component of a home security system that instantly alerts a user of moving objects in a particular area. Another important part of the home security system is smoke detectors.