Features1Ideal for traffic commandos and lifesaving, military training, sports competitions and training, and pet training. 2Suitable for referees, coaches, travelers, adventurers, guides, cheerleaders, lifeguards, teachers, transportation guides, seniors, etc. 3The cylindrical shape of the pronunciation mouth, the sound transmission distance is long, and can be heard from a distance. 4Portable size, light weight, come with a lanyard, easy hanging around the neck, easy to carry. 5There is a gear button on the side of the whistle, 4 gear positions (OFF/1/2/3), three optional sound effects, and the sound is clear.SpecificationItem Type: Electronic WhistleMaterial: ABSColor: As shown in the pictureLength: Approx.15cm/5.9inWeight: Approx.81g/2.9ozBattery: 4 x 1.5V CR2032 button battery (not included)How to Use1.Put in the battery (not included).2. There is a gear button on the side of the whistle, 4 gears (OFF/1/2/3), three different whistling can be adjusted.3. Press and hold the sound button in the middle of the whistle, the whistle will sound.Package List1 x Electronic Whistle(Battery Not Included) 1 x Lanyard 1 x Instruction Manual