DELTA m-system light signal 1-way light color red 1W 90-240V Our m-system offers different module inserts for signaling and communication purposes. Thanks to the modular design, all inserts for the DELTA line, DELTA miro, DELTA profil and DELTA style programs can be used with the m-system. A module carrier can be equipped with up to two different functions. DELTA m-system - design and quality in perfection from Siemens.