Interlogix NetworX NX-8E 16 Zones Hardwired Expansion Module (NX-216E) Microprocessor-controlled "Smart Module" 16-zone expander For the NetworX NX-8 and NX-8E control panels from Interlogix Optional tamper switch and power isolator Up to 5 expanders can be added to the NX-8 control panel Up to 23 expanders can be added to the NX-8E control panel