Built-in, only to stimulate better timbre: Continuous playing time should not exceed 8 hours, the volume of not more than 70 percent of the peak, with a small volume, the type of soothing music during the first 48 hours; medium volume with the next 72 hours;after that,100 hours large dynamic songs , with a medium volume playing different types of songs. please note that, although this earphone has a good adaptability to sound pressure, but still should be used to avoid the long time burn-in in large volume. Parameters: Earphone type:In-ear Plug type: 3.5mm Line length:1.2m Sensitivity: 95dB Power rating:20mW Impedance:32Ω
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