Package contents: you will receive 5 pieces whistles with lanyards. Each whistle measures about 2.7 x 0.6 inches / 7 x 2 cm. It is small and light enough to carry comfortably during all outdoor activities, including camping and hiking.Durable material: these safety whistles are made of super durable ABS plastic, which has a strong effect resistance, swimming, boating, kayaking, marine events and other outdoor activities, but also for dog training.Loud noises: the emergency whistle has two tubes, which determines it as a powerful noise maker. It can output sounds up to 120 dB, enough to hear a mile away without exaggeration. It is also effective as a signal whistle.Pea-free design: the signal whistle adopts the design of the pealess, which means that no moving parts are stuck, broken or frozen to block noise.The whistle works well in all conditions due to its excellent airflow design.It also has a comfortable mouth grip that guarantees that it is not guaranteed to stay on lips like metal in cold environments.FLEXIBLE USEThe safety stair features adjustable reflective lanyards and clips for high visibility even in the dark. You can edge lanyards on backpacks, sailing boats, camping hiking equipment, life jackets, kayak PFD, paddle board, bike or attach the clip on your waist belt or shoulder strap for quick and easy use in an emergency.