Wireless Headphones with Card 1.High quanlity approved 2.CE,CCC,ISO9000,UL 2.Support OEM,VCOM(own)brand wholesale Wireless Headphones with CardSecification: Frequency: 20 to 20kHzSensitivity: 112 ±3dBImpedance: 32ΩMaximum input power: 60mWCord length: 1.5MPlug type: 3.5mm stereoDriver Unit:40mm 5 hours palying timeStandard charge time:Approx 2 hoursRadio FM:88-108MHZMP3 Player decoding range: ...