The NRX-WS-RR Wireless Acoustic Wall Alarm is a battery-powered RF device for use with the NRXI-GATE wireless gateway (part of the AgileIQ RF product line) and operates on an addressable fire alarm system (using a compatible proprietary communications protocol). It is a two-stage siren module combined with a wireless RF transceiver that fits into a standard B501RF radio base. The corresponding volume and tone settings are selected using the dedicated application software (AgileIQ). The second-stage tone (interlinked with the first-stage tone) is controlled by the fire alarm control panel via the RF gateway.