The HSM2108 is an 8 zone expander for the DSC NEO. This module adds 8 hardwired zone terminals to your DSC NEO. You do not need this for wireless zones.

The HSM2108 is an 8-Hardwired zone expander that you can add to your DSC NEO security system if you need more hardwired zones than the initial zones that are on your main control panel. You can install the HSM2108 in the main cabinet or if you don't have room there then you can use one of DSC's expansion cabinets. This expander will connect to your DSC NEO's BUS terminals (Keypad connections) and it is compatible with the HS2016, HS2032, HS2064, and the HS2128.