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The NRX-REP radio repeater is a battery powered radio-frequency device, designed to be used with the NRXI-GATE gateway. It contains a transceiver and is integrated into a fire-fighting system that can be addressed through a proprietary communication protocol. The repeater inserts into the same base of the wireless sensors, the B501RF. It is used to expand the radio coverage of the fire detection system. The device is in accordance with EN54-25 and EN54-18, and meets the requirements of EN 300 220 and EN 301 489 standards 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 power on to normal RF communication when 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).