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Hi. Micro hydrophone, condensator, batery cell. The hydrophone could directly feed the batery trough condensator or direct electric flux. The environmental utrasounds or sounds could feed the scooter. My best regards.
Hi. Micro hydrophone, condensator, batery cell. The hydrophone could directly feed the batery trough condensator or direct electric flux. The environmental utrasounds or sounds could feed the scooter. My best regards.