Zeb-county is a compact and handy portable speaker that comes with multi-connectivity options like wireless BT,USB,micro SD and AUX. The speaker comes with a call function along with a built-in fm radio too. Speaker impedance 4?. Frequency response 120hz-15khz. Charging time 2.5H. Playback time approx. 10 hrs. Switch the speaker to FM mode and connect the micro USB cable to the micro USB port of the speaker and leave the other end free (this cable will act as the FM antenna). Read Less