2 in 1 rf wireless headphones for mp3 players KST- ... with FM 3.XBS effection •2 in 1 rf wireless headphones for mp3 players KST-670B-2:1 ... system, conference system(need to configure the FM transmitter)*5.A transmitter can use a lot of receiver (headset ... ,Blue ,black, orange,Weightheadphone:0.169kg ,Transmitter:0.128kgPacking ContentsHeadphone:1pcs, Transmitter with cable:1pcs ,Manual: 1sheet• Packing ...