Durable Material:These outdoor survival whistles are made of a hard alloy and feature a lanyard and a keychain. The dog whistle is durable, lightweight, and easy to carry. To ensure a loud, clear sound, blow the whistle emergency firmly and continuously.Relevant Usage:A whistle for coaches is a lightweight survival tool. A sports whistle is suitable for various outdoor activities such as outdoor travel, hiking, camping, boating, and fishing, making them important tools for attracting attention during outdoor travel and emergencies.Feature:This metal whistle features a unique dual-chamber design. A strong blow produces a loud and clear sound. The compact and lightweight Safety Whistle offers minimal extra weight while providing maximum safety, making it an essential safety item for outdoor activities.