I just intend to use it in case of attack or accident and when I tried to tell the truth it's very sharp whistles, limits must wear earplugs before use :) His power and not commensurate with the ball whistle football referee. Your friends will hate you for on, and it may be that you are supposed to help people come to you to complete you instead of you rescue because of his strident sound that tends to vibrate all flesh. I have attached to the end of my Fenix 55 that also in this little story.
