First Alert VISTAHEXPHW VISTA H Zone Expansion Module

Hardwired zone expansion module designed to add 8 additional hardwired zones (16 with zone doubling) per module to compatible security systems. Features built-in tamper detection with front cover monitoring and supervised wiring protection that triggers alarms if connections are compromised. Flexible mounting options support both surface wall and gang box installations. Removable terminal strips simplify wiring access for installers. Supports normally open, normally closed, double balanced, zone doubling, and end-of-line resistor configurations. On-board power supply regulation with 400ms loop response time and 2K ohm required loop resistance. Operating temperature range 32–122°F (0–50°C). Ideal for expanding zone capacity in existing security installations.