Features:1. ED4 of the built-in metal style HD capacitive mic.2. 9.6mm large ecological unit，horror explosive power.3. Medium frequency bang bo，shook;deep bass， powerful.4. The ed4， only to make a more profound， full of emotional sound.5. ED4 cavity using the &amp;quot;research-grade aluminum&amp;quot; forging， filling the simple， the atmosphere.6. Standard format adopted by international standards(American standard)， fully compatible with iphone， samsung， xiaomi and other international    standard-definition standard mobile phone calls.<br> Specifications:<br>          General Specification             Brand         KZ             Model         ED4             Color         Sliver， Gray             Cable Length         In-ear             Wearing Type         1.2m             Product Weight         35g           Technical Parameters             Connectivity         Wired control             Conectivity Interface         3.5mm             Driver Unit         9.6mm             Receive Sensitivity         96dB             Impedance         16&amp;Omega;             Frequency Response         20-20000Hz   <br> Package  Included:<br>                   1 X KZ ED4 Headphone             3 X Earmuffs(S\/M\/L)             1 X Manual