Features:7mm and 9mm dual moving coil unit make the middle and high frequency more natural and bass stronger.Built-in Microphone enables hands-free calls. With in-line control, easy to control music and calls.Light-weight in-ear headphones with 3 sizes of silicone earcaps ensures a long time comfortable wearing.Universal 3.5mm gold-plated plug, compatible with smart phone, Tablet PC, MP3 and other 3.5mm audio devices.You don't have to worry about running out of power, give you unlimited wired listening.Specifications:Brand Name: QKZModel Number: CK9Type: Dual moving coil in-ear headphonesDriver Unit: 9mm + 7mmFrequency Response: 20-20KHzResistance: 8Sensitivity: 963dBPlug: 3.5mm Stereo Gold-platedMicrophone: YesIn-line Remote: YesColor: Black, Blue (Optional)Cable Length: Approx. 1.2m / 3.93ftHeadphone Weight: Approx. 18g / 0.64ozPackage Size: Approx. 8.6 * 6.0 * 3.0cm / 3.38 * 2.36 * 1.18inPackage Weight: Approx. 39g / 1.40ozPackage List:1 * QKZ CK9 Earphone2 * Pairs of Earcaps1 * Cable Clip1 * Storage Box