Specification bluetooth audio receiver for speakers: 1.3.5mm Audio cable 2.USB ... cable 3.FM radio, earphone function Features: bluetooth audio receiver for speakers can link to iPad, MP3, MP4, Notebook, CD ... be charged when playing by plug in straightly. 1.Play music, with high-powered loudspeakers, long time play2.Build ... ,laptop,mobilephone as peripheral speaker. bluetooth audio receiver for speakers