The NW20 Emergency Whistle from Fenix is designed for use in emergency situations to alert a search and rescue team to your whereabouts. It can reach up to 120 dB using its dual-power design, while saving you 30% of the effort needed with an ordinary whistle. It has no pea, or other moving parts, making it ideal for wet conditions or freezing temperatures. The NW20 is made from stainless steel, so it will not rust or corrode. The whistle has a key ring for attaching to a jacket, backpack, keychain, or other gear.