A brand new electronic whistle, USB rechargeable, suitable for emergency calls in outdoor sports, competitions, camping, and other situations, including for referees, coaches, and teachers. Compared to traditional whistles, the electronic whistle does not require contact with the mouth. Simply press the sound button to produce a loud and clear sound, saving time and effort and avoiding saliva splashing between users. This whistle with a lanyard is ideal for emergency use by referees, physical education teachers, sailors, outdoor campers, sports competitions, traffic control, pet training, and self-defense. The electronic whistle has 3 different tones to meet different needs. All tones are loud, producing a sound effect of up to 120-150 decibels. Our mouthless whistle is made of high-quality ABS material, making it very sturdy and durable, and it does not release any harmful substances. This electronic whistle is easy to attract attention and can be directly charged via USB, making it more environmentally friendly and economical. This USB rechargeable electronic whistle is 10 times more durable than a regular button battery, providing up to 4 hours of continuous sound, saving you the cost of batteries. It also features an LED light for illumination in dark environments. Easy to use, it boasts an ergonomic design for comfortable one-handed operation and comes with a detachable lanyard for convenient carrying. [Portable] This whistle comes with a long lanyard, easily attaching to backpacks, sailboats, camping gear, life jackets, and kayaks. You can also tie the whistle around your neck, on a shoulder strap, waist belt, or backpack, or keep it in your pocket for quick use in emergencies. Color: Black Material: Plastic Package Contents: 1 x Electronic Whistle 1 x USB Data Cable (Random color and style, specific style not accepted) 1 x Lanyard (Random color and style, specific style not accepted) This package only includes the above contents; other products are not included. Note: Light reflection and different monitors may cause the color of the item in the picture to differ slightly from the actual item. The permissible measurement error is +/- 1-3 cm.