3 in 1 WHISTLE 3 in 1 multi-functions, it is an emergency whistle, also a compass and a thermometer, bring you necessary information during outdoor sports. EASY TO BE HEARD 3pcs super loud survival whistles can provide up to 120 decibels sound guaranteed, can be heard from far distances, and play its role in times of emergency. STURDY & DURABLE Made of Sturdy ABS, waterproof and durable, easily blew. Unlike metal whistles, can be freely touched in ultra low or high temperature. COMPACT & PORTABLE Less than 0.6OZ, easy to take, bring no burden to your outdoor sports, with neck lanyard easy to get in any situation, it also can be tied to your backpack, belt. MULTI-APPLICATION Suitable for camping, hiking, cycling, skiing, any kind of outdoor activities, and also for Coaches, Instructors, Sports, Teachers, Life Guard, Protection, Self Defense.