... 4, Any color is available 5, OEM/OBM/OD Airline earphone for noise cancelling functionPlug3.5*4.5*20.5Cold Test ... and well back to normal temperature 2Hplastic partsearlap,Ear cover,ornament,Decorative cover,tail cover,silicon cover.speaker10øImpedance16Ω±15%Sensitivity97dB ... to our factory ! Supervisory Control: Test Machines:Fashionable design colorful earphone show: Famous partners we work with: