Function: ABS material, hygienic and safe. Widely used in sports,party,travel,need help. Loud decibel, strong penetration power, no roll ball. Beautiful shape, fashionable appearance. Easy to use and make sound. Specifications: Condition: 100% Brand New Material: ABS Plastic Weight: Approx. 33g / 1.2oz Size: Approx. 5 * 2 * 0.8cm / 2.0 * 0.8 * 0.3in Color: Black Package List: 1 * Whistle 1 * Strap 2 * Tooth Protection 1 * Storage Box Question: [What should I do if there is a problem when the item arriv? ] Answer: If there is any problem with the product, please take pictures in time to preserve the evidence. You will receive our professional customer service and you will get satisfied answers. If you have any other questions, we will try our best to serve you as much as possible.