Nitecore NWS10 TC4 Titanium Outdoor Emergency Whistle 120 Decibeles (NWS10 Emergency Whistle) Constructed from polished TC4 titanium alloy for durability Bio-compatible, making it non-toxic to humans Corrosion resistant, sturdy and durable Single chambered design emits a high pitched frequency Maximum sound intensity of 120 decibels Titanium Alloy "Unit-Body" Construction Corrosion resistant Non-allergenic and non-toxic Maximum sound intensity of up to 120 decibels Compact and highly portable