BT2-7 Interface Module The Interface Module option provides remote automatic and manual control of devices such as civil defense sirens, visual alert lighting systems and any other systems that require activation and deactivation control. This option is added to Monaco's BT2-7 Radio Alarm System Transceiver with RXM/IM Kits. Each RXM/IM Kit provides four Form C SPDT relays for interfacing to local controls; up to three RXM/IM Kits may be added to a BT2-7 to provide control for a maximum of twelve relays. The contacts can switch 5 amps at 30 Vdc or 230 Vac. The BT2-7 retains full capability for monitoring and reporting up to 16 zones. Provides remote automatic and manual control of devices Four Form C SPDT relays Relay(s) turned on when an alarm is received and off when end of alarm message is received