An electronic whistle complete with loudspeaker, built-in membrane control panel and electronic controller, class AB voice amplifier 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 - 12 V, Consumption - 3 A, IP67, Frequency - 675 Hz, Acoustic Power - 122 dB. Dimensions - Ø 239 x 250 x 260 mm. Total kit wight – 3,9 kg. For vessels between 12 to 20 m length.