HIGH QUALITY MATERIAL - The whistle is made of high-quality aluminum alloy material, with polished finish and anti-oxidation coating surface,solid and durable.Not easy to stick dust, not easy to fade, and has a long service life. LIGHTWEIGHT AND CONVENIENT -The whistle weighs only 25 grams, it is easy to carry, and it will not cramp even if you use your hands and fingers for a long time. HIGH DECIBEL - The life-saving signal whistle adopts a double-tube design, which can transmit up to 150 decibels of sound.When used in emergencies and sports referees, distant sounds can be clearly heard.It is very durable and is a good helper for outdoorcamping and hiking. WIDELY USED - Not only is it suitable for emergency situations in sports events, it can also be an outdoor survival call signal, and it is a good item to meet the needs of daily life.It is an ideal choice for any outdoor activities such as hiking, hunting,fishing, boating, etc. PACKAGING AND APPLICATION - There are 2 signal whistles of different colors and two black lanyards in the package.It can be tied to a backpack or hung around the neck for easy carrying and preventing loss.It is a good partner for any kind of outdooractivities. Colour:Black and silverSpecifications: Name: double tube signal whistle. Material: stainless steel Size: length 5.7 cm, width 1.8 cm, thickness 0.8 cm. Weight: 25 g Decibels: 150 decibels. Colour: black and silver. Content: 2 x stainless steel whistle. 2 x black removable lanyards.