In the casing, air pressure makes a membrane vibrate which produces the signal sound.
Special versions are available for luxury yachts (www.zoellner-yacht.de || Info Sheet Yacht Horns), arctic or military vessels.
Ship class I
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| Type: | Makrofon ZM200/90 . | Makrofon ZM200/110 |
| Sound intensity: | 143 dB | 143 dB |
| Frequency: | 90 Hz | 110 Hz |
| Range: | 2 SM | 2 SM |
Ship class II
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| Type: | Makrofon M125/160 | Makrofon M125/130 | Makrofon M75F/260 |
| Sound intensity: | 138 dB | 138 dB | 138 dB |
| Frequency: | 160 Hz | 130 Hz | 260 Hz |
| Range: | 1,5 SM | 1,5 SM | 1,5 SM |
Ship class III + IV
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| Typ: | Makrofon M75F/260 | Makrofon M75F/370 |
| Sound intensity: | 130 dB | 130 dB |
| Frequency: | 260 Hz | 370 Hz |
| Range: | 1 SM | 1 SM |