Laser Break Beam Sensor : ID 2122 : $17.50 : Adafruit Industries, Unique & fun DIY electronics and kits
2 Car Garage Laser Beam Parking System Light Motion Sensor | eBay
Perimeter protection with laser detectors from SICK | SICK AG - YouTube
Laser Sensors Shed Light On Motion Control | Motion Control & Motor Association Industry Insights
Amazon.com: SpyX / Lazer Trap Alarm – Safe Laser Alarm Toy for Spy Kids to Protect Stuffs. Invisible Infrared Beam Spy Gadget for Kids. Motion Sensor/Detector Toy for Boys & Girls :
SPT Outdoor Quad-Beam Photoelectric Sensor for Up to 450 ft. in Black 15-947 - The Home Depot