Product Description Stereo earphone with neck strip, packing in transparent cylinder Product Feature Packaging--> transparent cylinder Product Specification/Models Speaker Dimension: 15mm dia Impedance: 32 Ohm Sensitivity: 108dB S.P.L. at 1KHz Frequency Response: 20Hz-20,000Hz Rated Power: 15mW Power Capability: 150mW Cable Length: Approx. 1.2M +-0.3m Plug Type: 3.5mm Stereo Application MP3/ iPod/ PMP/ CD players, etc.