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Radio double technology detector: optical smoke and heat detector, suitable for hidden and open fire. Two-way radio transmission with the use of dual-frequency with 7 channels 868.15 MHz or 869.85 MHz. 3 mW maximum radiated power and 5 dBm receiver sensitivity. Equipped with two color LED interior placed at the center for a 360-degree visibility. Double lithium battery, primary and secondary, for a long life fully monitored. Operating temperature -30°C to +70°C. Relative humidity up to 90% non-condensing. Dimensions 54mm high and 110mm diameter.