... 2.USB cable 3.FM radio, earphone function Features: bluetooth audio receiver for speakers can link to iPad, MP3, MP4, Notebook ... play2.Build-in stereo FM radio3.Build-in 1450mAH Li-ion battery, support long time play4.Using new technology, Nice acoustic ... , build-in mp3,mp4,laptop,mobilephone as peripheral speaker. bluetooth audio receiver for speakers