- Enhanced signal processing - 360° x 7.5 m (24 ft) pattern - Surface/semi-flush mountable - Internal pointability - Sealed detector chamber The ceiling mount, low profile panoramic DS936 PIR Detector uses alternate polarity pulse count. It also uses a pointable Fresnel lens to provide up to 7.5 m (24 ft) of coverage and can be mounted on the surface, or semi-flush directly to a ceiling or a standard octagonal electrical box.