![](https://gqt.gr/987/df851-carrier-outdoor-sensor-cable-for-flexzone-150m.jpg)
The improved Microphonic Electret Transducer cable (DF851) is mounted on a fence or roof to detect vibrations caused by cutting, climbing, lifting, or otherwise disturbing the fence or wall/roof. The microphonic cable converts the vibrations into electrical signals, which are carried back to DF951 processor for outdoor applications or to DF450 processor for indoor applications.
Outdoor sensor cable for FlexZone, 150m