Acme whistles acme thunderer 660 whistle orange possibly the biggest selling whistle of all time. Possibly the biggest selling whistle of all time, the acme thunderer 660 is easy to blow, small, and delivers a high-pitch 117dba tone that cuts through the noisiest pool environment. Favoured by customers in colder settings where metal might stick to the skin, it is equally popular with poolside officials, swimming teachers, and coaches. Its compact plastic construction makes it a reliable, lightweight choice for anyone who needs a loud, dependable signal at short notice. Loud, reliable, and built for the poolside. 117Dba high pitch easy to blow plastic construction cold-weather friendly pea whistle poolside essential 3 key features effortless to blow the thunderer 660 is designed so that a strong, clear signal requires minimal effort. This makes it ideal for extended sessions where a teacher or official needs to signal repeatedly without fatigue. Even at low pressure, the pea mechanism produces a reliable, carrying tone. Seriously loud at 117dba, this whistle produces one of the loudest outputs available in a compact plastic body. That volume level ensures your signal reaches every corner of a busy pool hall, cutting through splashing water and background noise instantly. There is no need to repeat yourself when the thunderer 660 does the work. Plastic for poolside comfort unlike metal whistles, the plastic body will not stick to lips or skin in cold or damp conditions, mak...