MFi licensed Lightning Connection ensures secure zero noise connection??ensures 100% compatibility with iPhone cell phone perfectly??Lightning connector?? specially for iPhone7/7 Plus?? iPhone 6/6plus?? iPhone5?? other iOS devices like iPads?? iPods</br>Balance Sound:Powerful Bass?? Cle" and Crisp High Tones forming absolute perfect balanced sound??transmit the natural sound.</br>Comfortable: Soft silicone earbuds give you in-ear comfort for hours?? even when you're running. Light?? maximized comfort along with increased stability makes it ideal for long time usage and outdoor activity</br>Warranty: Gopala 2-year warranty?? replacement or full refund (include shipping fee) and friendly customer service.</br></br>Product Description</br></br>?? Speaker?:9mm Moving coil dynamic speaker<br>? ?? Frequency response: 20~20K Hz?<br>? ?? Impedance: 32ohms<br>? ?? Sensitivity: 103dB (+/-3dB)??Mic Sensitivit