Marco electronic whistle (with one microphone and siren effect)

Approved electronic whistle complete with loudspeaker, built-in membrane control panel and electronic controller. New ultrasonic heating system for improved acoustic membrane performance. Meets COLREG 1972 IMO class IV international regulations with RINA, LLOYD'S REGISTER MCA, BUREAU VERITAS, NMMA and BSH homologations. Includes mounting kit.