What does the occasional green light mean on a pest defence plug in?

The occasional green light on a pest defense plug-in typically indicates that the device is functioning properly and is actively working to deter pests. It may signal that the device is emitting the ultrasonic frequencies or other signals designed to repel pests. If the light is flashing or behaving differently, it could indicate a need for attention, such as a change in settings or a malfunction. Always refer to the manufacturer's instructions for specific meanings related to your device.