... ,CCC,ISO9000,UL 2.Support OEM,VCOM(own)brand wholesale Wireless Headphones with CardSecification:Transmitted power:Class2 (max 4dBm)Frequency: 20 to ... )Palying time:continue about 10 hoursUSB jacket:USB 2.0Features:Wireless headphones with Cards and radio combo features; mainly for mid-high ...