When you give customer a promotional item such as Interchangeable Cover Ear Buds and they experience its 6U transducer, 32Ω±15％ impedance, 113±5dB sensitivty at (1KHz / 5mW), 20Hz-20KHz frequency respond, 20KHz frequency respond, 5mW rated input power, 10mW maximum input power, 120CM polyvinyl chloride, φ3.5 plug and usability of listening to music, it makes them consider what type of services or products you have to offer.
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