Problem to be solved: to install a speaker with a characteristic of reaching the far side with a light weight and a directional warning sound to the far side, and to deliver the sound effect such as the intimidation sound and the explosion sound of the natural bird predator, and the countermeasure equipment system to prevent the bird flying and the animal .A hood 3 is attached to the drone 1, and hood 3 is mounted on the front surface of the speaker to enhance directivity. It is output from the speech generator 6 of the Raptor. The audio signal of the intonation sound is converted into a high voltage speaker terminal voltage by the amplified output of the piezoelectric amplifier 5, and reaches a distance of 100 m by the sound pressure of 100 dB or more. The power source of the piezoelectric amplifier 5 and the sound generator 6 are supplied by a battery 7.Diagram
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