The NRX-WS-RR radio sounder is a battery-powered radio frequency device designed to be used in conjunction with the NRXI-GATE radio gateway. It contains a transceiver and is integrated into a fire protection system addressable through a proprietary communication protocol. NRX-WS-RR is an acoustic signaling device that has 32 tones and three selectable volumes for each tone. It is mounted on a plastic base B501RF-RR and its degree of protection is IP24. The device complies with EN54-3 and EN54-25. The resynchronization time is 35 seconds, from the power of the device to reach the radio communication with the active network.