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Close-up portrait of hard hearing man placing hand to ear asking someone to speak up or listening carefully. Human emotion facial expression. Isolated, on white background
Tower Antenna Creating Digital Halo Above Natural Clouds. Communication Technology Concept.
Abstract blue and green wave with microscopic particles flowing moving on wave and light abstract background.
Sound wave stream animation. Short wavelength to long, audio frequency. Yellow grow line. High, low amplitude, pitch, voltage, herts. Flowing pan. For medical, music, earthquake, education, ac footage