Optical-thermal conventional smoke detector. Recommended for slow and quick progressing fires. Includes a compension algorithm. Through S300RPTU wireless programmer it can be realize a test equipment, measurement of dirt levels, production date and last maintenance display , adjust the sensitivity, cancel the LED blinking and assign a directioning from 1 to 255. Includes a bicolor LED to indicate the sensor status and a remote indicator output. Requiers B401 or B401R base.