AC Type Relay Module(wireless module, alarm relay) 1. It can be wired to respond ... alarms, CO alarms, Heat alarm or both Relay Module(wireless module, alarm relay module)1. It can be wired to respond to ... AC or 28V DCAmbient Humidity: 10%~90%Interconnect Models: This module ca be with the following smoke, heat, smoke/CO, ... voltage interconnect alarms with a YELLOW interconnect wire. AC Type Relay Module