18 emergency whistles in 9 colors: red, orange, green, blue, purple, pink, sky blue, black, and silver. Abundant quantity for family, group, club, or organization use. Material and build: aluminum alloy; sturdy and not easy to break; compact and lightweight; smooth surface; durable for long-term use. Loud signaling: high-volume acoustics designed to attract attention over a wide range; easy to blow in emergency situations. Portable and convenient: 1.85 inches long; includes a key ring for attachment to keys, wearing around the neck, or clipping to gear; compact and unobtrusive. Use scenarios: - Outdoor safety: camping, hiking, cycling, or running to signal teammates or call for help. - Water and outdoor activities: boating or fishing to alert others in the vicinity. - Crowd and roadside situations: events, gatherings, or roadside emergencies for quick signaling and locating. Notable advantages: versatile color assortment, reliable aluminum construction, compact size, and a simple ring attachment for easy携带 (note: ensure plain ASCII; remove non-ASCII).