Greatly improve your odds of being saved when you are heard with this 120 decibel whistle. With the unique sounding chamber, you will save 30% of the effort you would need with ordinary whistle. With no movable parts and pealess design the Fenix emergency whistle is an essential piece of safety equipment to have on you during outdoor activities or in your own home during a natural disaster. Dimensions are 2.2in x .7in. Weighs .7oz