Depending on the type, the sound is produced electro-mechanically or by an electro-magnetic pressure chamber.
| Type: | ZETFON 300/310 ZETFON 300/310 + Commando-facility |
ZETFON 400/310 AC/DC |
|---|---|---|
| Sound intensity: | 130 dB | 130 dB |
| Frequency: | 310 Hz | 310 Hz |
| Range: | 1 SM | 1 SM |