Product Description Specifications Top of the line sound quality. Robust and tangle free "soft zippered" earphones. Features include metal ear heads with copper ring, microphone, mute switch, multiple sized ear buds and drawer string nylon pouch. Moulded PVC zipper pullers - POA Product Size: 1.2 m x 5 mm x 2 mm (total length), 400 mm (zipper length), 38 x 6 x 6 mm (mic/mute switch), Branding Area: 18 x 4 mm (zipper puller), 8 x 6 mm (clip), 25 x 3 mm (mic), 21 x 21 mm, 31 x 11 mm (moulded) Standard Packaging: Black Nylon Pouch Certification: CE, FCC, RoHS Specifications: Frequency response 20 Hz - 20 KHz, Distortion: <3%, Impedance: 32 ohms, Sensitivity: 106±3 dB, Plug: 4 contact, 3.5 mm.