5-In-1 Survival WhistleThis handy tool has a compass, signaling mirror, flint starter, a waterproof container, and lanyard. It is a very loud shrill whistle. The sound travels over 1 mile. Dimension : 4.75 x 1.25 x 1.25Specification of 5-In-1 Survival WhistleProduct DetailsDimensions 10X0.01X10Weight 0.01..