Key Features of KZ ZST X 1DD+1BA Earphones -Upgraded version of KZ ZST -Improved 10mm XUN Dynamic Driver+30095 Balanced Armature -Detachable 2 pin cable and support HD microphone -Classic cyan and purple color -Ergonomics design Specification Product Name: KZ ZST X In-ear Earphone Earphone type: In-ear Impedance: 12Ω Earphone sensitivity: 107dB/mW Frequency range: 20-40000Hz Pin Type:0.75mm 2Pin Cable Length: 125±5cm Color: Cyan/Purple Whether with microphone: optional