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The NRX-TDIFF thermal detector is a battery powered radio-frequency device, designed to be used with the NRXI-GATE radio gateway. It contains a transceiver and is integrated into a fire-fighting system that can be addressed through a proprietary communication protocol. NRX-TDIFF is a thermovelocimetric heat detector with a fixed alarm threshold of 58 ° C (A1R class). The sensors are to be fixed to the ceiling by the base B501RF. The devices comply with EN54-25 and EN54-5 and meet the requirements of EN 300 220 and EN 301 489 for compliance with the R & TTE Directive. Standby current: 120 μA to 3 V DC: (typical in normal operating mode) Red LED current: 4 mA max. Resynchronization time: 35 s (max time from power-on device to normal RF communication when network is active) Batteries: 4 Duracell Ultra 123 Battery life: 4 years at 25 ° C Radio frequency: 865-870 MHz Output power RF: 14 dBm (max) flow rate: 500 m (typical in free air) Relative humidity: 10% to 93% (no condensation).