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 "research-grade aluminum" 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. Specifications: 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 16Ω Frequency Response 20-20000Hz Package Included: 1 X KZ ED4 Headphone 3 X Earmuffs(S\/M\/L) 1 X Manual