Size: Approx. 4.2 inches (107 mm) x Diameter: 0.6 inches (14 mm); LED: 1 white LED light; Weight: Approx. 0.8 oz (24 g) (not including batteries); Battery: AAA alkaline battery included; Material: Aluminum; Packaging: Comes with a decorative box; Note: Reflective material on the neck strap (approx. 19.7 inches (50 cm) when folded); Please check if the light point light and whistle ring when the product arrives. If there is a defective, we will replace it free of charge. Our traffic safety goods, crime prevention goods, and disaster preparedness goods are made for traffic safety, security, and disaster prevention, but we do not guarantee your safety.