IPA28W Highlights universal 3.5mm jack for a wide range application， especially for iPhone， mini size for easy carrying， built-in volume control button for convenient operation General Spec Earphone Type earbud type Impedance 32 ohms Frequency Response 20-20000Hz Connector 3.5mm silver plated stereo plug Button volume. control， microphone and answer button Cord 1.2m cable Application iPhone 3GS/4G Package Details Weight: 10.70 g Size: 6.5*2.2*1.9 cm Package Includes 1 × In-ear Earphone