Speaker, Applicable for ipod, MP4 Player, Laptop, PC and More.With special particular patent in worldwide. Be applicable for MP3, MP4, laptop, PC, MD ... : 5V +0.5V Suitable temperature: 0 - 40 C Be applicable for MP3, MP4, laptop, PC, MD, mobile phone, and more With ... in pocket The outlook is gyroidal in special style Inherent 3.5mm audio plug Other audio lines are unnecessary, making it easy ...