The DSC MX945 is an MX addressable loop device for the IQ Pro panels. It allows you to connect a standard hardwired sensor to the addressable MX loop. It is compatible with normally open and normally closed contacts. To add the MX945, you want to make sure you have a DSC HSM3105 MX addressable loop module. All MX devices require the HSM3105 to provide the MX addressable loop connections.