The CDX-NAM includes digital quad zone logic, in order to generate an alarm 4 zones must be crossed this helps with efficient detection, preventing false alarm such as small animals that may cross the detection points. Active IR Digital Anti-Masking The CDX series uses AIR technology to detect masking. For a stable performance, the CDX series differentiate between true masking and other masking caused by environmental changes such as dust/dirt adhesion, temperature changes and direct light by optimizing it's sensitivity. Tough Microwave Module Most combination detectors use an universal MW module. OPTEX developed an original patented Microwave module specially designed for its security detectors.This stabilizes the detection performance from natural degradation to realise a long operating life. Applications Roof / Ceiling