whistle Lifesaving Dual whistle Spot goods emergency whistle rescue

Outdoor whistle Lifesaving Dual whistle Spot goods emergency whistle rescue

1.Dual-frequency design. The left and right sides of the vocal cavity with different sizes, at the same time to produce a high low-frequency sound, ensuring different environment, conditions are excellent penetration
2.A design of anti. Can not walking, with the mouth contained also need not worry about the airflow will whistle is blown out
3.Speak easily. l, attention must be paid to conserve energy, good post must be ableto easily out of sound
4.Integrated design, sturdy and reliable

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