DELTA m-system Buzzer 230 V 50/60 Hz, 80 dB (A) Adjustable loudness level carbon metallic DELTA m-system - design and quality to perfection from Siemens. Our m-system provides different module inserts for signaling and communication purposes. The Siemens m-system offers the following advantages: 1. Due to its modular design, use is possible in the DELTA line, DELTA miro, DELTA profil and DELTA style ranges. 2. A module holder can be fitted with up to two different functions. &DPMD_ACC602_001_000_1001214&