The ADW 535 uses a virtually indestructible metal sensing tube for reliable, decades-long detection with no need for replacement. The ADW is totally immune to adverse ambient conditions such as harsh sunlight, electrical interference and lightning. Lightning protection is ensured by earthing the sensing tube. In practice this results in a virtually unlimited service life. Because the sensing tube on the ADW 535 is made from copper or steel, it is also resistant to damage from rodents and other pests which in other systems lead to error messages, false alarms and the need for repairs.