Photoelectric Beams

Commonly used to secure and/or monitor entrances such as driveways or shopfronts, these beams can be installed inside or outside and can be set up to notify you of a visitor by triggering a pleasant chime, a loud buzzer, or almost any other bell or piezo you can think of.
When connected to an alarm panel, photoelectric beams can be armed outside of hours to trigger alarm activations and security responses if required.