An electronic whistle complete with loudspeaker, built-in membrane control panel, electronic controller and automatic fog signal or automatic customised signal. Ultrasonic heating system for improved acoustic membrane performance. Meets COLREG 1972 IMO class III international regulations with RINA, LLOYD'S REGISTER MCA, BUREAU VERITAS, NMMA and BSH homologations. Includes mounting kit. Technical details: Voltage - 24 V, Consumption - 4 A, IP67, Frequency - 690 Hz, Acoustic Power - 131 dB. Dimensions - Ø 325 x 437 x 351 mm. Total kit wight – 7,92 kg. For vessels between 20 to 75 m length.