Make the Coach Referee So Easy: The electric whistle gets rid of the traditional way of blowing a whistle with your mouth, and meanwhile provides a loud, clear, strong and easily recognizable sound. It will be more convenient and safer in the referee,training and SOS. Adjustable 3 Different High Volume Electric Whistles: Adjust the volume to the level that best meets your needs in different spaces and occasions, so that the sound can be heard and protect your hearing. It must be an awesome high volume electronic whistlefor P.E. teachers, basketball coaches referees, outdoor camping, dogs training, hiking lifeguard SOS survival emergency. Ergonomic Loudest Electric Whistle: The streamlined appearance and compact size makes the grip of the whistle more comfortable and makes you feel relaxed when using it. One-button switch can create 1205dB volume, it will more sanitary and convenientamong all sporting events, company activity, school game or other training etc.