... with FM radio, support U disk,TF card,mp3 player, microphone with reverberant function, that will increase sound-surround ambiance. A ... at high temperature or humid surroundings, do not let the microphone approach to speaker (otherwise will howling), do not disassemble or ... .2. Pls keep the best distance and volume when use microphone to avoid howling.3. Accompanied battery, adapt, line, Wire ...