The Fox40 provides a loud, clear and consistent sound every time (125 dB). The electronic whistle is hand operated, hygienic and easy. With no less than 3 distinct tones and a sound that can be aimed in specific directions, you can reach everyone effortlessly, both outdoors and indoors. This lightweight whistle has a size of 12 cm and comes with a handy wrist cord and a 9V battery. So as soon as you receive the whistle, you can immediately use it to coach your team or determine a match.