The multi detector contains one photo-electric (optical) smoke detector and one heat detector within the low profile housing. The latest IC technology will secure the highest reliability possible. It has unleaded soldering. The smoke detection chamber has a high-efficient optical system with an infrared light LED and a photodiode with two lenses. Light reflection is used to detect smoke, which enters the detection chamber through an insect filter and an optical labyrinth. The heat sensing element is a thermistor. The detector is supplied with two red LEDs that will be blinking when the detector has activated alarm. It also has a green polling LED. The detector is plugged in an analogue base (3312 / 4313 / 3379). The COM loop is connected to the base, which also can have terminals for an external LED, e.g. BARIL. The detector is intended for indoor use for systems FT128V2 and FT1020G3.