HART Electronic WhistleStay hygienic and be heard clearly with the HART Electronic Whistle, the hands free solution for teachers, coaches, referees and event organisers. Unlike traditional whistles, this electronic version requires no mouth contact, making it a safe and sanitary option for shared use in schools, clubs and professional environments. Designed with a simple push button operation, the whistle can project 3 distinct tones, making it ideal for managing different