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 ... with high capacity, protected by multiple electro circuit, and the USB jack supports recharging repeatedly, enabling more than 4 hours of ...