Studio Quality Sound Collapsible for Easy Storage Works with Headphone Jack of any MP3 Player or Phone. Compatible with HBC100 Plus and HBC200 General Specification Headphone Speaker: 30mm (1.18in) Impedance: 32ohm Sensitivity: 108db+3db Frequency Response: 20khz Dual Embedded Microphone Microphone Impedance: 58db +3db
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