The DP721T is a 700 series addressable multisensor detector.
The ADxxN is a Digital LHD cable with a fixed temperature activation rating. It has a Nylon outer sheath for UV protection and increased durability
The ADxxSS is a Digital LHD cable with a fixed temperature activation rating. It has a Stainless steel over PVC outer sheath for increased mechanical
The AAN model is an Analogue LHD cable in a Nylon outer sheath that provides additional UV protection making it suitable for external applications