1) digital design , fashionable and elegant 2) RF wireless transmitting audio signal, wireless receiver, the effective distance is 15m 3) in-built an electronic all channel automatic searching FM radio(FM88M-108M) 4) the transmitter is powered by USB directly, no need battery 5) automatic consumption decrease design, low power consumption, long using time 6) special chip, high receiving sensitivity 7) supporting various audio facilities with audio output jack (e.g. television, computer , DVD, CD, MP3, MP4, language learning reciter etc)