... PU,PVC,Fabric synthetic, extendable line DT-021 Metallic Earphone for iphone and ipod Specification1: Frequency Response: 20Hz-20KHz2:Speaker Impedance: 16Ω/ ... aluminum Service:We pursue the goals to have the original and nature music, so we design ingeniously, care about ... the details, blend the natural environment and modern technology. *Package: 1) Each piece has the ...