... effection •2 in 1 rf wireless headphones for mp3 players KST-670B-2:1.wireless headset functionality,2.At any ... system, conference system(need to configure the FM transmitter)*5.A transmitter can use a lot of receiver (headset ) ... batteriesColorcolorful,Blue ,black, orange,Weightheadphone:0.169kg ,Transmitter:0.128kgPacking ContentsHeadphone:1pcs, Transmitter with cable:1pcs ,Manual: 1sheet• Packing: ...