A Driveway Motion Sensor is the part of a driveway alert system that will detect vehicles and people. Driveway Motion Sensors and the wireless transmitter are normally combined into one device (unit).
These sensors will detect vehicles, people, and if you are out in the country, possibly deer. The sensor and transmitter are combined into one device (unit). These detector / sensors are generally the least expensive and easiest to install and most commonly used driveway motion alert systems.