The Selco infrared strip barrier beams are a technology solution providing maximum protection while reducing false alarms. This is an ideal perimeter protection for businesses and homes, providing peace of mind and early warning. IR strip barrier beams can be used indoors or outdoors and are available in various beam configurations (height, no. of beams and range). When two adjacent beams are interrupted simultaneously for a period of 40 milliseconds, an alarm condition will result when the alarm system is armed.