Multi-Function 3 In 1 Carabiner Whistle With Led Light For Hiking Climbing, Black Size: 3.74*1.38inch (9.5*3.5cm). Mini size, multifunctional and durable, field survival essential supply. Key ring makes more convenient to carry it. Loud whistle, great for sporting events, camping & hiking, boating. With a spring loaded gate, can attach to a wide range of fixing points quickly and securely.