Wireless Headphones with Card 1.High quanlity approved 2.CE,CCC,ISO9000,UL 2.Support OEM,VCOM(own)brand wholesale Wireless Headphones with CardSecification:Transmitted power:Class2 (max 4dBm)Frequency: 20 to 20kHzReceive Sensitivity: -80dBmBattery:rechargeble 460mAhPower supply:DC 5VWeight:77gOperation range:Within 10metersAudio format supply:MP3/WMA/WAVExternal memory enlarge:TF card(Max 8G) ...