A multifunctional ball whistle 3in1 made of high-quality plastic. Perfect for transmitting sound signals - alarms, commands etc. On the side walls of the whistle there is a compass and a thermometer (ranging from 20 up to 50°C). The attached lanyard enables to hanged the whistle around the neck. 3in1 model is a perfect offer for instructors, globetrotters and fans of outdoor.