The Kockum Sonics Electro-Tyfon MT150/130 is an electrically driven Loudspeaker for use on vessels. The Electro-Tyfon MT150/130 is suited for vessels of 75 up to 200m in length. The Kockum Sonics AT 150/130 has a frequency of 130 Hz, which is according to IMO regulations for small and middle-sized vessels.