Conventional optic smoke detector. Recommended for slow-progressing fires, with visible smoke particles. Includes compensation algorithms. Through S300RPTU wireless programmer it can be realized 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.