PACKAGING:The package contains 4 pcs emergency whistle for walking with landyard which easy to carry. TEXTURE OF MATERIAL: The safety whistle for hiking is made of environmentally friendly plastic and made of lightweight plastic, it is durable, not easily damaged, comes with a chain, does not fade, and can be hung on a backpack. LONG TRANSMISSION DISTANCE: In many places, the distance of sound transmission is not enough for people to hear your voice, but whistles for teachers are more distant than sound propagation, making loud noises often requires little effort before rescue arrives. MULTI-AUDIO: The safety whistle for women with multi-audio design is more recognizable, and various blowing methods can produce different sounds, making it more recognizable. USAGE: Suitable for outdoor activities such as camping, sports, mountaineering, hunting, fishing, boating, etc; also can be used to train dogs, referee whistles, and safety whistles. Package Including:4 x Safety whistle Material: Plastic Size: 7 x 3 x 0.7 cm / 2.7 x 1.2 x 0.3 in Color: Green.Products from KJ's store