The LuxoGear survival whistle is a double tubes emergency whistle; a high pitched powerful noise maker with dual sound chambers. It can provide up to 120 decibel sound power, enough to be heard over a mile away. Cannot be overblown, works great as signal whistle. Designed with no moving parts, nothing to obstruct sound, and nothing to jam, break or freeze. Lightweight and fail safe that works well in any conditions with excellent airflow design. Comfortable mouth grip that won't stick to lips in cold environments. Has an adjustable reflective lanyard and clip and made of ABS plastic construction that is moisture resistant.