The WSK-RELAY Addressable Wireless Relay Module is a wireless relay module is a standard-sized module that allows the fire alarm control panel (FACP) to switch discrete contacts. The relay contains an isolated set of Form-C contacts, which operate as a SPDT switch. The relay module can be used to activate functions such as a remote power supply (in conjunction with a monitor module), elevator recall, door holders and fan shutdown of wired devices or SWIFT devices within the same mesh network. Note: Must be used with Silent Knight 6000 Series addressable fire alarm control panels.