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Mountain alloy whistle by Lifesystems is manufactured from tough lightweight aluminium alloy, and is recommended as an essential piece of kit for people in the outdoors. This whistle has an anodised body with a keyring attachment and a single blast can reach 100 decibels.
A whistle can be used to alert people if you are in distress. The internationally recognised distress signal is 6 blasts of the whistle with a 1 minute break and then repeated. The reply is 3 blasts with the same pause.
