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The triple-mode smoke sensor NRX-SMT3 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. The unit detects smoke and heat (such as a temperature detector of 58 ° C). An infrared sensor integrates detection capability and increases immunity to false alarms. The sensor must be fixed to the ceiling using the B501RF base. The device is compliant with EN54-25, EN54-5 (A1R Class) and EN54-7, and meets 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 (maximum time from turning on the device to normal RF communication when the network is active) Batteries: 4 Duracell Ultra 123 Battery life: 4 years at 25oC Radio frequency: 865-870 MHz; RF output power: 14 dBm (max) Range: 500 m (typical in free air) Relative humidity: 10% to 93% (no condensation).