Beam Motion SensorWith a range of 31 inches (800mm) and without the need to use a reflector, these sensors can be mounted near entry points, engines, or at the helm/console and are an excellent choice to use on exposed decks. These sensors use a true photoelectric beam, not an infrared field of view like our ePIR or Infrared Motion Sensor, which ensures protection against false alarms due to shadows, sunlight, etc. The sensor will push an alert to the boat owner upon unauthorized entry and can be programmed to sound an audible alarm.*DC Relay required when connecting multiple beam sensors to the same input on the MTC