ADJUSTABLE 3 TONE & 3 VOLUME - Electric whistle with 3-level adjustable volume and three different tones, which can deliver 100 to 130 dB to meet the needs of different indoor and outdoor occasions. You can choose the best sound according to your requirements. WORK MORE EFFICIENTLY AND EASIER: Tired of shouting and whistling? Coach electric whistle is your best choice. Easy to excite, loud, consistent sound every time. Sports whistle helps your voice during the break. Without blowing, but also sends out a louder, more powerful, and consistent sound compared to traditional whistles. ELECTRONIC WHISTLES: Electric whistle powered by three AAA batteries. The service life is longer than charging whistles or whistles powered by Cr2032 lithium batteries. You don't have to worry about suddenly running out of power. In the wild, the role of a lifesaver! Electronic whistle for teachers, coaches, referees, sports training, outdoor camping. Electronic dog whistle for training, hiking, SOS survival emergency whistle. EXCELLENT QUALITY: The outdoor whistle is made of high-quality ABS environmental protection material. It is tasteless and healthy. The strong anti-split design ensures that this gymnastic whistle produces a strong and consistent sound. Electronic handheld whistle. It is a good gift for referee teachers and police and is suitable for camping, hiking, outdoors, traffic guides, pet training, and sporting events. PACKAGE INCLUDES: 1x electric whistle 4.76'' x 1.3''. 1 x drawstring bag. 1 x screwdriver (for replacing the battery). 3 x batteries. Handheld sports whistle comes with a detachable wrist strap lanyard. Small and easy to carry. One-handed operation. Simple and convenient. Suitable for sporting events, extracurricular activities, outdoor camping, hiking, etc.