... ,CCC,ISO9000,UL 2.Support OEM,VCOM(own)brand wholesale Wireless Headphones with CardSecification: Frequency: 20 to 20kHzSensitivity: 112 ±3dBImpedance: 32ΩMaximum ... palying timeStandard charge time:Approx 2 hoursRadio FM:87-108MHZMP3 Player decoding range:8kbps-320kbpsFeatures:Wireless headphones with Card; fashion and professional headphonesSupports ...