1. Tangle-free earphone: convenient to use-flat noodle wire easy to unravel.2. Ergonomics design reduces ear pressure and enhances comfortable wearing experience. Dynamic drive units deliver original sound.3. In-line Microphone and volume control features convenient usage with Play/Pause、 Hand-Free Calling function.4. Fully compatible with iPhone 6/6s/6 Plus/6s Plus/5/5c/5s、 iPad Mini、 iPad Air、 iPod touch 5、 iPod touch 4、iPod Nano 7、 iPod Nano 6、 iPod Nano 5No need to reach to your cellphone to answer/end phone calls when the earphone is connected to your phone.Functions:Answer/ end phone calls: press onceReject phone calls: press button for 2 secondsPlay/pause: press once; Volume control: +/-Specification:Support system: IOSImpedance: 32ΩRated power: 2mWWeight: 10.68gSensitivity: 104＼3dBFrequency: 20Hz-20kHzPackage includes:1 X Pisen Hi-fi in-ear earphone1 pair of Small silicone eartips1 pair of Large silicone eartips1 X User manual1 X Portable headphone box