【ADJUSTABLE 3 DIFFERENT VOLUME WHISTLE】: 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 whistle for P.E. teachers, coaches referees, outdoor sport training, SOS survival emergency.
【DURABLE and HIGH QUALITY】Made of superior ABS material-More often, we will use this electronic whistle outdoors, so it is necessary to have a crack-resistant and fall-resistant shell. In addition, each whistle comes with 4 Cr2032 Lithium batteries individually packaged to ensure that you can use it for a longer time outdoors. If the sound becomes abnormal, please replace the battery.
