... Teaching, Lecture&Speech, Introduction, Tour guiding, Commercial Promotion etc. * Multifunctional: Morning exercise, Rehearsing, Dancing, Singing, Practising, FM Radio, MP3 ... radio.* USB and TF dock. (MP3)* Mini USB charging dock.* Aux in socket for outer audio device. * Removable ... mode) * Charger: DC 5v/500mAh (Round or Flat options)* Charging time: 6-8 hours* Speaker Diameter: 77mm * Covering range ...