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Final Defense is a rescue survival whistle.The combination of the whistle and the zipper is not easy to lose and the user can use it to send a signal in the first time in a very urgent situation.By blowing air into the whistle to drive the inner wheels to generate electricity and light, combined with RECCO technology to locate the target, rescuers can find the target faster.When other methods of rescue fail, using this physical method can give the rescuer a last chance to survive.